fix(desktop-entries): Filter desktop entries by App ID rather than Name

This change also avoids any entry whose Exec is `false`. This fixes the GNOME Extensions app, which has two entries with the same Name, but differing App ID's. One of these should be ignored by the launcher, and has its Exec as `false`.

plugins/src/desktop_entries/mod.rs

@@ -25,14 +25,14 @@ struct Item {
 
 impl Hash for Item {
     fn hash<H: Hasher>(&self, state: &mut H) {
-        self.name.hash(state);
+        self.appid.hash(state);
         self.src.hash(state);
     }
 }
 
 impl PartialEq for Item {
     fn eq(&self, other: &Self) -> bool {
-        self.name == other.name && self.src == other.src
+        self.appid == other.appid && self.src == other.src
     }
 }
 
@@ -120,6 +120,10 @@ impl<W: AsyncWrite + Unpin> App<W> {
 
                     if let Some((name, exec)) = entry.name(locale).zip(entry.exec()) {
                         if let Some(exec) = exec.split_ascii_whitespace().next() {
+                            if exec == "false" {
+                                continue;
+                            }
+
                             let item = Item {
                                 appid: entry.appid.to_owned(),
                                 name: name.to_string(),