feat: add editable dock launchers

cosmic-app-list/i18n/en/cosmic_app_list.ftl

@@ -5,4 +5,10 @@ quit-all = Quit All
 new-window = New Window
 run = Run
 run-on = Run on {$gpu}
-run-on-default = (Default)
+run-on-default = (Default)
+edit-launcher = Edit launcher
+launcher-name = Name
+launcher-command = Command
+launcher-icon = Icon
+save = Save
+cancel = Cancel

cosmic-app-list/i18n/fr/cosmic_app_list.ftl

@@ -6,3 +6,9 @@ new-window = Nouvelle fenêtre
 run = Exécuter
 run-on = Lancer avec { $gpu }
 run-on-default = (Défaut)
+edit-launcher = Modifier le lanceur
+launcher-name = Nom
+launcher-command = Commande
+launcher-icon = Icône
+save = Enregistrer
+cancel = Annuler

cosmic-app-list/src/app.rs

@@ -3,6 +3,7 @@
 
 use crate::{
     fl,
+    launcher_edit::{self, LauncherEditRequest},
     wayland_subscription::{
         OutputUpdate, ToplevelRequest, ToplevelUpdate, WaylandImage, WaylandRequest, WaylandUpdate,
         wayland_subscription,
@@ -47,7 +48,7 @@ use cosmic::{
         icon::{self, from_name},
         image::Handle,
         rectangle_tracker::{RectangleTracker, RectangleUpdate, rectangle_tracker_subscription},
-        svg, text,
+        svg, text, text_input,
     },
 };
 use cosmic::{
@@ -387,10 +388,25 @@ pub struct Popup {
     popup_type: PopupType,
 }
 
+#[derive(Debug, Clone)]
+struct LauncherEditState {
+    original_app_id: String,
+    source_path: PathBuf,
+    original_name: String,
+    original_exec: String,
+    name: String,
+    exec: String,
+    icon: String,
+    terminal: bool,
+    saving: bool,
+    error: Option<String>,
+}
+
 #[derive(Clone, Default)]
 struct CosmicAppList {
     core: cosmic::app::Core,
     popup: Option<Popup>,
+    launcher_edit: Option<LauncherEditState>,
     subscription_ctr: u32,
     item_ctr: u32,
     desktop_entries: Vec<DesktopEntry>,
@@ -432,6 +448,7 @@ struct CosmicAppList {
 pub enum PopupType {
     RightClickMenu,
     ToplevelList,
+    LauncherEditor,
 }
 
 #[derive(Debug, Clone)]
@@ -440,6 +457,13 @@ enum Message {
     Wayland(WaylandUpdate),
     PinApp(u32),
     UnpinApp(u32),
+    EditLauncher(u32),
+    LauncherNameChanged(String),
+    LauncherExecChanged(String),
+    LauncherIconChanged(String),
+    SaveLauncherEdit,
+    CancelLauncherEdit,
+    LauncherEditSaved(Result<launcher_edit::LauncherEditResult, String>),
     /// Yoda: pointer entered (Some) or left (None) a dock icon — drives
     /// the macOS Tahoe-style hover magnification effect.
     DockItemHover(Option<DockItemId>),
@@ -822,10 +846,45 @@ impl CosmicAppList {
             .collect();
     }
 
+    fn sync_pinned_list_from_config(&mut self) {
+        for item in self.pinned_list.drain(..) {
+            if !item.toplevels.is_empty() {
+                self.active_list.push(item);
+            }
+        }
+
+        self.pinned_list = find_desktop_entries(&self.desktop_entries, &self.config.favorites)
+            .zip(&self.config.favorites)
+            .map(|(de, original_id)| {
+                if let Some(p) = self
+                    .active_list
+                    .iter()
+                    .position(|dock_item| dock_item.desktop_info.id() == de.id())
+                {
+                    let mut d = self.active_list.remove(p);
+                    d.desktop_info = de.clone();
+                    d.original_app_id.clone_from(original_id);
+                    d
+                } else {
+                    self.item_ctr += 1;
+                    DockItem {
+                        id: self.item_ctr,
+                        toplevels: Vec::new(),
+                        desktop_info: de.clone(),
+                        original_app_id: original_id.clone(),
+                    }
+                }
+            })
+            .collect();
+    }
+
     /// Close any open popups.
     fn close_popups(&mut self) -> Task<cosmic::Action<Message>> {
         let mut commands = Vec::new();
         if let Some(popup) = self.popup.take() {
+            if popup.popup_type == PopupType::LauncherEditor {
+                self.launcher_edit = None;
+            }
             commands.push(destroy_popup(popup.id));
         }
         if let Some(popup) = self.overflow_active_popup.take() {
@@ -1199,6 +1258,182 @@ impl cosmic::Application for CosmicAppList {
                     return destroy_popup(popup_id);
                 }
             }
+            Message::EditLauncher(id) => {
+                let Some(dock_item) = self.pinned_list.iter().find(|t| t.id == id).cloned() else {
+                    return Task::none();
+                };
+                let Some(exec) = dock_item.desktop_info.exec() else {
+                    return Task::none();
+                };
+                let Some(existing_popup) = self.popup.take() else {
+                    return Task::none();
+                };
+                let Some(rectangle) = self.rectangles.get(&dock_item.id.into()) else {
+                    self.popup = Some(existing_popup);
+                    return Task::none();
+                };
+
+                let original_name = dock_item
+                    .desktop_info
+                    .desktop_entry("Name")
+                    .map(ToString::to_string)
+                    .or_else(|| {
+                        dock_item
+                            .desktop_info
+                            .name(&self.locales)
+                            .map(Cow::into_owned)
+                    })
+                    .unwrap_or_else(|| dock_item.original_app_id.clone());
+                let original_exec = exec.to_string();
+
+                self.launcher_edit = Some(LauncherEditState {
+                    original_app_id: dock_item.original_app_id.clone(),
+                    source_path: dock_item.desktop_info.path.clone(),
+                    original_name: original_name.clone(),
+                    original_exec: original_exec.clone(),
+                    name: original_name,
+                    exec: original_exec,
+                    icon: dock_item
+                        .desktop_info
+                        .icon()
+                        .unwrap_or_default()
+                        .to_string(),
+                    terminal: dock_item.desktop_info.terminal(),
+                    saving: false,
+                    error: None,
+                });
+
+                let new_id = window::Id::unique();
+                let mut popup_settings = self.core.applet.get_popup_settings(
+                    existing_popup.parent,
+                    new_id,
+                    None,
+                    None,
+                    None,
+                );
+                let iced::Rectangle {
+                    x,
+                    y,
+                    width,
+                    height,
+                } = *rectangle;
+                popup_settings.positioner.anchor_rect = iced::Rectangle::<i32> {
+                    x: x as i32,
+                    y: y as i32,
+                    width: width as i32,
+                    height: height as i32,
+                };
+                popup_settings.positioner.size_limits = Limits::NONE
+                    .min_width(480.)
+                    .min_height(1.)
+                    .max_width(520.)
+                    .max_height(1000.);
+
+                self.popup = Some(Popup {
+                    parent: existing_popup.parent,
+                    id: new_id,
+                    dock_item,
+                    popup_type: PopupType::LauncherEditor,
+                });
+
+                return Task::batch([destroy_popup(existing_popup.id), get_popup(popup_settings)]);
+            }
+            Message::LauncherNameChanged(name) => {
+                if let Some(edit) = self.launcher_edit.as_mut()
+                    && !edit.saving
+                {
+                    edit.name = name;
+                    edit.error = None;
+                }
+            }
+            Message::LauncherExecChanged(exec) => {
+                if let Some(edit) = self.launcher_edit.as_mut()
+                    && !edit.saving
+                {
+                    edit.exec = exec;
+                    edit.error = None;
+                }
+            }
+            Message::LauncherIconChanged(icon) => {
+                if let Some(edit) = self.launcher_edit.as_mut()
+                    && !edit.saving
+                {
+                    edit.icon = icon;
+                    edit.error = None;
+                }
+            }
+            Message::SaveLauncherEdit => {
+                let Some(edit) = self.launcher_edit.as_mut() else {
+                    return Task::none();
+                };
+                if edit.saving {
+                    return Task::none();
+                }
+                if let Err(error) =
+                    launcher_edit::validate_launcher_fields(&edit.name, &edit.exec, &edit.icon)
+                {
+                    edit.error = Some(error);
+                    return Task::none();
+                }
+
+                let request = LauncherEditRequest {
+                    current_app_id: edit.original_app_id.clone(),
+                    source_path: edit.source_path.clone(),
+                    name: edit.name.clone(),
+                    exec: edit.exec.clone(),
+                    icon: edit.icon.clone(),
+                    terminal: edit.terminal,
+                    replace_localized_name: edit.name.trim() != edit.original_name.trim(),
+                    disable_dbus_activation: edit.exec.trim() != edit.original_exec.trim(),
+                };
+
+                edit.saving = true;
+                edit.error = None;
+
+                return Task::perform(launcher_edit::save_launcher_edit(request), |result| {
+                    cosmic::Action::App(Message::LauncherEditSaved(result))
+                });
+            }
+            Message::CancelLauncherEdit => {
+                return self.close_popups();
+            }
+            Message::LauncherEditSaved(result) => match result {
+                Ok(result) => {
+                    tracing::info!(
+                        app_id = result.new_app_id,
+                        path = ?result.path,
+                        "saved editable launcher"
+                    );
+
+                    let mut favorites = self.config.favorites.clone();
+                    let mut favorites_changed = false;
+                    for favorite in &mut favorites {
+                        if *favorite == result.old_app_id && *favorite != result.new_app_id {
+                            *favorite = result.new_app_id.clone();
+                            favorites_changed = true;
+                        }
+                    }
+
+                    if favorites_changed {
+                        self.config.update_pinned(
+                            favorites.clone(),
+                            &Config::new(APP_ID, AppListConfig::VERSION).unwrap(),
+                        );
+                        self.config.favorites = favorites;
+                    }
+
+                    self.update_desktop_entries();
+                    self.sync_pinned_list_from_config();
+                    self.launcher_edit = None;
+                    return self.close_popups();
+                }
+                Err(error) => {
+                    if let Some(edit) = self.launcher_edit.as_mut() {
+                        edit.saving = false;
+                        edit.error = Some(error);
+                    }
+                }
+            },
             Message::Activate(handle) => {
                 if let Some(tx) = self.wayland_sender.as_ref() {
                     let _ = tx.send(WaylandRequest::Toplevel(ToplevelRequest::Activate(handle)));
@@ -1651,6 +1886,9 @@ impl cosmic::Application for CosmicAppList {
             },
             Message::ClosePopup => {
                 if let Some(p) = self.popup.take() {
+                    if p.popup_type == PopupType::LauncherEditor {
+                        self.launcher_edit = None;
+                    }
                     return destroy_popup(p.id);
                 }
             }
@@ -1665,42 +1903,16 @@ impl cosmic::Application for CosmicAppList {
             }
             Message::ConfigUpdated(config) => {
                 self.config = config;
-                // drain to active list
+                self.update_desktop_entries();
-                for item in self.pinned_list.drain(..) {
+                self.sync_pinned_list_from_config();
-                    if !item.toplevels.is_empty() {
-                        self.active_list.push(item);
-                    }
-                }
-
-                // pull back configured items into the favorites list
-                self.pinned_list =
-                    find_desktop_entries(&self.desktop_entries, &self.config.favorites)
-                        .zip(&self.config.favorites)
-                        .map(|(de, original_id)| {
-                            if let Some(p) = self
-                                .active_list
-                                .iter()
-                                // match using heuristic id
-                                .position(|dock_item| dock_item.desktop_info.id() == de.id())
-                            {
-                                let mut d = self.active_list.remove(p);
-                                // but use the id from the config
-                                d.original_app_id.clone_from(original_id);
-                                d
-                            } else {
-                                self.item_ctr += 1;
-                                DockItem {
-                                    id: self.item_ctr,
-                                    toplevels: Vec::new(),
-                                    desktop_info: de.clone(),
-                                    original_app_id: original_id.clone(),
-                                }
-                            }
-                        })
-                        .collect();
             }
             Message::CloseRequested(id) => {
-                if Some(id) == self.popup.as_ref().map(|p| p.id) {
+                if let Some(popup) = &self.popup
+                    && popup.id == id
+                {
+                    if popup.popup_type == PopupType::LauncherEditor {
+                        self.launcher_edit = None;
+                    }
                     self.popup = None;
                 }
                 if self.overflow_active_popup.is_some_and(|p| p == id) {
@@ -2372,6 +2584,19 @@ impl cosmic::Application for CosmicAppList {
                         }),
                     );
 
+                    if is_pinned && desktop_info.exec().is_some() {
+                        content = content.push(
+                            menu_button(
+                                row![
+                                    icon::icon(from_name("edit-symbolic").into()).size(16),
+                                    text::body(fl!("edit-launcher"))
+                                ]
+                                .spacing(8),
+                            )
+                            .on_press(Message::EditLauncher(*id)),
+                        );
+                    }
+
                     if !toplevels.is_empty() {
                         content = content.push(divider::horizontal::light());
                         content = match toplevels.len() {
@@ -2418,6 +2643,89 @@ impl cosmic::Application for CosmicAppList {
                         )
                         .into()
                 }
+                PopupType::LauncherEditor => {
+                    let Some(edit) = self.launcher_edit.as_ref() else {
+                        return text::body("").into();
+                    };
+
+                    let spacing = theme::spacing();
+                    let can_save = !edit.saving
+                        && launcher_edit::validate_launcher_fields(
+                            &edit.name, &edit.exec, &edit.icon,
+                        )
+                        .is_ok();
+
+                    let mut form = column![
+                        text::title4(fl!("edit-launcher")),
+                        text_input("", edit.name.as_str())
+                            .label(fl!("launcher-name"))
+                            .on_input(Message::LauncherNameChanged)
+                            .on_submit(|_| Message::SaveLauncherEdit)
+                            .width(Length::Fill)
+                            .size(14),
+                        text_input("", edit.exec.as_str())
+                            .label(fl!("launcher-command"))
+                            .on_input(Message::LauncherExecChanged)
+                            .on_submit(|_| Message::SaveLauncherEdit)
+                            .width(Length::Fill)
+                            .size(14),
+                        text_input("", edit.icon.as_str())
+                            .label(fl!("launcher-icon"))
+                            .on_input(Message::LauncherIconChanged)
+                            .on_submit(|_| Message::SaveLauncherEdit)
+                            .width(Length::Fill)
+                            .size(14),
+                    ]
+                    .spacing(spacing.space_s)
+                    .width(Length::Fill);
+
+                    if let Some(error) = edit.error.as_ref() {
+                        form = form.push(text::caption(error.as_str()).class(
+                            cosmic::theme::Text::Color(theme.cosmic().destructive_color().into()),
+                        ));
+                    }
+
+                    let cancel =
+                        button::custom(text::body(fl!("cancel")).center().width(Length::Fill))
+                            .on_press_maybe(if edit.saving {
+                                None
+                            } else {
+                                Some(Message::CancelLauncherEdit)
+                            })
+                            .padding([spacing.space_xxs, spacing.space_s])
+                            .width(142);
+
+                    let save = button::custom(text::body(fl!("save")).center().width(Length::Fill))
+                        .class(Button::Suggested)
+                        .on_press_maybe(if can_save {
+                            Some(Message::SaveLauncherEdit)
+                        } else {
+                            None
+                        })
+                        .padding([spacing.space_xxs, spacing.space_s])
+                        .width(142);
+
+                    let actions = row![horizontal_space(), cancel, save]
+                        .spacing(spacing.space_xxs)
+                        .align_y(Alignment::Center);
+
+                    let content = column![form, actions]
+                        .spacing(spacing.space_m)
+                        .padding(spacing.space_m)
+                        .width(Length::Fill);
+
+                    self.core
+                        .applet
+                        .popup_container(container(content).width(Length::Fill))
+                        .limits(
+                            Limits::NONE
+                                .min_width(480.)
+                                .min_height(1.)
+                                .max_width(520.)
+                                .max_height(1000.),
+                        )
+                        .into()
+                }
                 PopupType::ToplevelList => match self.core.applet.anchor {
                     PanelAnchor::Left | PanelAnchor::Right => {
                         let mut content =

cosmic-app-list/src/launcher_edit.rs

@@ -0,0 +1,378 @@
+// Copyright 2026 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
+use std::{
+    env,
+    ffi::OsString,
+    io::ErrorKind,
+    path::{Path, PathBuf},
+};
+
+use tokio::fs;
+
+#[derive(Clone, Debug)]
+pub struct LauncherEditRequest {
+    pub current_app_id: String,
+    pub source_path: PathBuf,
+    pub name: String,
+    pub exec: String,
+    pub icon: String,
+    pub terminal: bool,
+    pub replace_localized_name: bool,
+    pub disable_dbus_activation: bool,
+}
+
+#[derive(Clone, Debug)]
+pub struct LauncherEditResult {
+    pub old_app_id: String,
+    pub new_app_id: String,
+    pub path: PathBuf,
+}
+
+#[derive(Clone, Debug)]
+struct ValidLauncherEdit {
+    current_app_id: String,
+    source_path: PathBuf,
+    name: String,
+    exec: String,
+    icon: String,
+    terminal: bool,
+    replace_localized_name: bool,
+    disable_dbus_activation: bool,
+}
+
+pub fn validate_launcher_fields(name: &str, exec: &str, icon: &str) -> Result<(), String> {
+    validate_required("Name", name)?;
+    validate_required("Command", exec)?;
+    validate_optional("Icon", icon)?;
+    Ok(())
+}
+
+pub async fn save_launcher_edit(
+    request: LauncherEditRequest,
+) -> Result<LauncherEditResult, String> {
+    let request = validate_request(request)?;
+    let (new_app_id, target_path) =
+        target_launcher_path(&request.current_app_id, &request.source_path)?;
+
+    let source = read_source_desktop_entry(&request).await?;
+    let rendered = render_editable_desktop_entry(&source, &request);
+
+    let Some(parent) = target_path.parent() else {
+        return Err("Desktop file target has no parent directory".to_string());
+    };
+
+    fs::create_dir_all(parent)
+        .await
+        .map_err(|err| format!("Could not create applications directory: {err}"))?;
+
+    let tmp_path = temporary_path(&target_path)?;
+    fs::write(&tmp_path, rendered)
+        .await
+        .map_err(|err| format!("Could not write temporary desktop file: {err}"))?;
+
+    if let Err(err) = fs::rename(&tmp_path, &target_path).await {
+        let _ = fs::remove_file(&tmp_path).await;
+        return Err(format!("Could not install desktop file: {err}"));
+    }
+
+    Ok(LauncherEditResult {
+        old_app_id: request.current_app_id,
+        new_app_id,
+        path: target_path,
+    })
+}
+
+fn validate_request(request: LauncherEditRequest) -> Result<ValidLauncherEdit, String> {
+    let name = validate_required("Name", &request.name)?;
+    let exec = validate_required("Command", &request.exec)?;
+    let icon = validate_optional("Icon", &request.icon)?;
+
+    Ok(ValidLauncherEdit {
+        current_app_id: request.current_app_id,
+        source_path: request.source_path,
+        name,
+        exec,
+        icon,
+        terminal: request.terminal,
+        replace_localized_name: request.replace_localized_name,
+        disable_dbus_activation: request.disable_dbus_activation,
+    })
+}
+
+fn validate_required(label: &str, value: &str) -> Result<String, String> {
+    let value = validate_optional(label, value)?;
+    if value.is_empty() {
+        return Err(format!("{label} cannot be empty"));
+    }
+    Ok(value)
+}
+
+fn validate_optional(label: &str, value: &str) -> Result<String, String> {
+    if value.contains('\0') || value.contains('\n') || value.contains('\r') {
+        return Err(format!("{label} cannot contain line breaks"));
+    }
+    Ok(value.trim().to_string())
+}
+
+async fn read_source_desktop_entry(request: &ValidLauncherEdit) -> Result<String, String> {
+    if request.source_path.as_os_str().is_empty() {
+        return Ok(minimal_desktop_entry());
+    }
+
+    match fs::read_to_string(&request.source_path).await {
+        Ok(source) => Ok(source),
+        Err(err) if err.kind() == ErrorKind::NotFound => Ok(minimal_desktop_entry()),
+        Err(err) => Err(format!("Could not read source desktop file: {err}")),
+    }
+}
+
+fn minimal_desktop_entry() -> String {
+    "[Desktop Entry]\nType=Application\n".to_string()
+}
+
+fn user_applications_dir() -> Result<PathBuf, String> {
+    if let Some(xdg_data_home) = env::var_os("XDG_DATA_HOME").filter(|value| !value.is_empty()) {
+        return Ok(PathBuf::from(xdg_data_home).join("applications"));
+    }
+
+    let Some(home) = env::var_os("HOME").filter(|value| !value.is_empty()) else {
+        return Err("Neither XDG_DATA_HOME nor HOME is set".to_string());
+    };
+
+    Ok(PathBuf::from(home).join(".local/share/applications"))
+}
+
+fn target_launcher_path(app_id: &str, source_path: &Path) -> Result<(String, PathBuf), String> {
+    let applications_dir = user_applications_dir()?;
+    if source_path.starts_with(&applications_dir) {
+        return Ok((app_id.to_string(), source_path.to_path_buf()));
+    }
+
+    let desktop_id = normalize_desktop_id(app_id)?;
+    Ok((
+        desktop_id.clone(),
+        applications_dir.join(format!("{desktop_id}.desktop")),
+    ))
+}
+
+fn normalize_desktop_id(app_id: &str) -> Result<String, String> {
+    if app_id.contains('\0') || app_id.contains('\n') || app_id.contains('\r') {
+        return Err("Desktop ID cannot contain line breaks".to_string());
+    }
+
+    let desktop_id = app_id
+        .chars()
+        .map(|c| if c == '/' { '-' } else { c })
+        .collect::<String>();
+
+    if desktop_id.trim().is_empty() {
+        return Err("Desktop ID cannot be empty".to_string());
+    }
+
+    Ok(desktop_id)
+}
+
+fn temporary_path(target_path: &Path) -> Result<PathBuf, String> {
+    let Some(file_name) = target_path.file_name() else {
+        return Err("Desktop file target has no filename".to_string());
+    };
+
+    let mut tmp_file_name = OsString::from(".");
+    tmp_file_name.push(file_name);
+    tmp_file_name.push(format!(".tmp-{}", std::process::id()));
+
+    Ok(target_path.with_file_name(tmp_file_name))
+}
+
+fn render_editable_desktop_entry(source: &str, request: &ValidLauncherEdit) -> String {
+    let mut updates = vec![
+        ("Type", "Application".to_string()),
+        ("Name", request.name.clone()),
+        ("Exec", request.exec.clone()),
+        ("Icon", request.icon.clone()),
+        (
+            "Terminal",
+            if request.terminal { "true" } else { "false" }.to_string(),
+        ),
+        ("X-COSMIC-UserEditable", "true".to_string()),
+        ("X-COSMIC-SourceDesktopId", request.current_app_id.clone()),
+    ];
+
+    if !request.source_path.as_os_str().is_empty() {
+        updates.push((
+            "X-COSMIC-SourceDesktopPath",
+            request.source_path.to_string_lossy().to_string(),
+        ));
+    }
+
+    if request.disable_dbus_activation {
+        updates.push(("DBusActivatable", "false".to_string()));
+    }
+
+    set_desktop_entry_keys(
+        source,
+        &updates,
+        request.replace_localized_name,
+        request.disable_dbus_activation,
+    )
+}
+
+fn set_desktop_entry_keys(
+    source: &str,
+    updates: &[(&str, String)],
+    replace_localized_name: bool,
+    remove_try_exec: bool,
+) -> String {
+    let mut out = Vec::new();
+    let mut seen = vec![false; updates.len()];
+    let mut in_desktop_entry = false;
+    let mut saw_desktop_entry = false;
+
+    for line in source.lines() {
+        if let Some(section) = section_name(line) {
+            if in_desktop_entry {
+                insert_missing_keys(&mut out, updates, &seen);
+            }
+
+            in_desktop_entry = section == "Desktop Entry";
+            saw_desktop_entry |= in_desktop_entry;
+            if in_desktop_entry {
+                seen.fill(false);
+            }
+
+            out.push(line.to_string());
+            continue;
+        }
+
+        if in_desktop_entry && let Some(key) = desktop_entry_key(line) {
+            if replace_localized_name && key.starts_with("Name[") {
+                continue;
+            }
+
+            if remove_try_exec && key == "TryExec" {
+                continue;
+            }
+
+            if let Some(index) = updates
+                .iter()
+                .position(|(update_key, _)| *update_key == key)
+            {
+                out.push(format!("{}={}", updates[index].0, updates[index].1));
+                seen[index] = true;
+                continue;
+            }
+        }
+
+        out.push(line.to_string());
+    }
+
+    if in_desktop_entry {
+        insert_missing_keys(&mut out, updates, &seen);
+    }
+
+    if !saw_desktop_entry {
+        let mut with_desktop_entry = Vec::with_capacity(out.len() + updates.len() + 2);
+        with_desktop_entry.push("[Desktop Entry]".to_string());
+        insert_missing_keys(
+            &mut with_desktop_entry,
+            updates,
+            &vec![false; updates.len()],
+        );
+        if !out.is_empty() {
+            with_desktop_entry.push(String::new());
+            with_desktop_entry.extend(out);
+        }
+        out = with_desktop_entry;
+    }
+
+    let mut rendered = out.join("\n");
+    rendered.push('\n');
+    rendered
+}
+
+fn insert_missing_keys(out: &mut Vec<String>, updates: &[(&str, String)], seen: &[bool]) {
+    for (index, (key, value)) in updates.iter().enumerate() {
+        if !seen[index] {
+            out.push(format!("{key}={value}"));
+        }
+    }
+}
+
+fn section_name(line: &str) -> Option<&str> {
+    let trimmed = line.trim();
+    trimmed
+        .strip_prefix('[')
+        .and_then(|value| value.strip_suffix(']'))
+}
+
+fn desktop_entry_key(line: &str) -> Option<&str> {
+    let line = line.trim_start();
+    if line.starts_with('#') || line.starts_with(';') {
+        return None;
+    }
+
+    line.split_once('=').map(|(key, _)| key.trim_end())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn request() -> ValidLauncherEdit {
+        ValidLauncherEdit {
+            current_app_id: "org.example.App".to_string(),
+            source_path: PathBuf::from("/usr/share/applications/org.example.App.desktop"),
+            name: "Example".to_string(),
+            exec: "example --new".to_string(),
+            icon: "example-custom".to_string(),
+            terminal: false,
+            replace_localized_name: true,
+            disable_dbus_activation: true,
+        }
+    }
+
+    #[test]
+    fn updates_desktop_entry_without_dropping_action_groups() {
+        let source = "\
+[Desktop Entry]
+Type=Application
+Name=Old
+Name[fr]=Ancien
+Exec=old
+TryExec=old
+Icon=old
+DBusActivatable=true
+Actions=new-window;
+
+[Desktop Action new-window]
+Name=New Window
+Exec=old --new-window
+";
+
+        let rendered = render_editable_desktop_entry(source, &request());
+
+        assert!(rendered.contains("Name=Example\n"));
+        assert!(!rendered.contains("Name[fr]="));
+        assert!(rendered.contains("Exec=example --new\n"));
+        assert!(rendered.contains("Icon=example-custom\n"));
+        assert!(rendered.contains("DBusActivatable=false\n"));
+        assert!(!rendered.contains("TryExec="));
+        assert!(rendered.contains("[Desktop Action new-window]\n"));
+        assert!(rendered.contains("Exec=old --new-window\n"));
+    }
+
+    #[test]
+    fn preserves_localized_names_when_name_is_unchanged() {
+        let mut edit = request();
+        edit.replace_localized_name = false;
+
+        let rendered = render_editable_desktop_entry(
+            "[Desktop Entry]\nName=Example\nName[fr]=Exemple\nExec=old\n",
+            &edit,
+        );
+
+        assert!(rendered.contains("Name=Example\n"));
+        assert!(rendered.contains("Name[fr]=Exemple\n"));
+    }
+}

cosmic-app-list/src/lib.rs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 mod app;
+mod launcher_edit;
 mod localize;
 mod wayland_handler;
 mod wayland_subscription;