fix(appearance): reload system theme after building themes

cosmic-settings/src/pages/desktop/appearance/theme_manager.rs

@@ -8,7 +8,6 @@ use cosmic::iced_core::Color;
 
 use cosmic::Task;
 use cosmic::theme::ThemeType;
-use std::borrow::BorrowMut;
 use std::sync::Arc;
 
 use crate::app;
@@ -175,18 +174,32 @@ impl Manager {
             }
         }
 
-        let mut tasks: Vec<Task<app::Message>> = Vec::new();
+        let map_data_fn = |customizer: &ThemeCustomizer| {
-        let customizers = match stage {
-            ThemeStaged::Current => vec![self.selected_customizer_mut()],
-            ThemeStaged::Both => vec![self.light.borrow_mut(), self.dark.borrow_mut()],
-        };
-
-        customizers.into_iter().for_each(|customizer| {
             let builder = customizer.builder.0.clone();
             let (current_theme, config) = customizer.theme.clone();
+            (builder, current_theme, config)
+        };
 
-            tasks.push(
+        let current = map_data_fn(if self.mode.0.is_dark {
-                cosmic::Task::future(async move {
+            &self.dark
+        } else {
+            &self.light
+        });
+
+        let other = if let ThemeStaged::Both = stage {
+            Some(map_data_fn(if !self.mode.0.is_dark {
+                &self.dark
+            } else {
+                &self.light
+            }))
+        } else {
+            None
+        };
+
+        let mut data = std::iter::once(current).chain(other.into_iter());
+
+        cosmic::task::future(async move {
+            while let Some((builder, current_theme, config)) = data.next() {
                 if let Some(config) = config {
                     let new_theme = builder.build();
                     theme_transaction!(config, current_theme, new_theme, {
@@ -210,14 +223,10 @@ impl Manager {
                         window_hint;
                     });
                 }
-                })
+            }
-                .discard(),
-            );
-        });
 
-        cosmic::task::batch(tasks).chain(cosmic::task::future(async {
             app::Message::SetTheme(cosmic::theme::system_preference())
-        }))
+        })
     }
 
     #[inline]