Add support for Flatpak installs of several editors (#887)

* Update linux.ts

Fix #885 for VSCode, VSCodium, and VSCode Insiders

* Use full path for Flatpak binaries

Adds full path, as previous method didn't function properly.

app/src/lib/editors/linux.ts

@@ -43,18 +43,26 @@ const editors: ILinuxExternalEditor[] = [
       '/snap/bin/code',
       '/usr/bin/code',
       '/mnt/c/Program Files/Microsoft VS Code/bin/code',
+      '/var/lib/flatpak/app/com.visualstudio.code/current/active/export/bin/com.visualstudio.code',
+      '.local/share/flatpak/app/com.visualstudio.code/current/active/export/bin/com.visualstudio.code',
     ],
   },
   {
     name: 'Visual Studio Code (Insiders)',
-    paths: ['/snap/bin/code-insiders', '/usr/bin/code-insiders'],
+    paths: [
+      '/snap/bin/code-insiders',
+      '/usr/bin/code-insiders',
+      '/var/lib/flatpak/app/com.visualstudio.code.insiders/current/active/export/bin/com.visualstudio.code.insiders',
+      '.local/share/flatpak/app/com.visualstudio.code.insiders/current/active/export/bin/com.visualstudio.code.insiders',
+    ],
   },
   {
     name: 'VSCodium',
     paths: [
       '/usr/bin/codium',
-      '/var/lib/flatpak/app/com.vscodium.codium',
+      '/var/lib/flatpak/app/com.vscodium.codium/current/active/export/bin/com.vscodium.codium',
       '/usr/share/vscodium-bin/bin/codium',
+      '.local/share/flatpak/app/com.vscodium.codium/current/active/export/bin/com.vscodium.codium',
     ],
   },
   {