fix(server): scrub AppImage XDG_DATA_DIRS and GSETTINGS_SCHEMA_DIR from terminals

apps/server/src/terminal/Manager.test.ts

@@ -1345,6 +1345,8 @@ it.layer(
           OWD: "/home/user/project",
           PATH: `${appDir}/usr/bin:${appDir}:/usr/local/bin:/usr/bin:/bin`,
           LD_LIBRARY_PATH: `${appDir}/usr/lib:/home/user/.local/lib`,
+          XDG_DATA_DIRS: `${appDir}/usr/share:/usr/local/share:/usr/share`,
+          GSETTINGS_SCHEMA_DIR: `${appDir}/usr/share/glib-2.0/schemas`,
           TEST_TERMINAL_KEEP: "keep-me",
         },
       });
@@ -1364,6 +1366,11 @@ it.layer(
       // mount segments that the runtime prepended.
       expect(spawnInput.env.PATH).toBe("/usr/local/bin:/usr/bin:/bin");
       expect(spawnInput.env.LD_LIBRARY_PATH).toBe("/home/user/.local/lib");
+      // XDG_DATA_DIRS keeps the host entries but drops the AppImage share dir.
+      expect(spawnInput.env.XDG_DATA_DIRS).toBe("/usr/local/share:/usr/share");
+      // GSETTINGS_SCHEMA_DIR pointed only at the mount, so it is removed and
+      // gsettings falls back to the host schema location.
+      expect(spawnInput.env.GSETTINGS_SCHEMA_DIR).toBeUndefined();
       // Unrelated host vars still pass through untouched.
       expect(spawnInput.env.TEST_TERMINAL_KEEP).toBe("keep-me");
     }),

apps/server/src/terminal/Manager.ts

@@ -1069,10 +1069,19 @@ function shouldExcludeTerminalEnvKey(key: string): boolean {
 // They describe the AppImage itself, not the user's session, so terminals must
 // not inherit them.
 const APPIMAGE_RUNTIME_ENV_KEYS = ["APPIMAGE", "APPDIR", "ARGV0", "OWD"] as const;
-// PATH-style variables the AppImage runtime prepends with its temporary mount
-// (e.g. /tmp/.mount_T3-XXXX/usr/bin). Only the mount segments are dropped; the
-// user's real entries are preserved.
-const APPIMAGE_PATH_LIKE_ENV_KEYS = ["PATH", "LD_LIBRARY_PATH"] as const;
+// Colon-separated search-path variables the AppImage runtime points at its
+// temporary mount (e.g. /tmp/.mount_T3-XXXX/usr/bin, the bundled glib schemas,
+// and an $APPDIR/usr/share XDG data entry). Only the mount segments are
+// dropped; the user's real entries are preserved. When nothing but mount
+// segments remain the variable is removed entirely so consumers fall back to
+// their platform default (e.g. gsettings finds the host schemas instead of
+// reporting "No schemas installed"). See issues #1699 and #5059.
+const APPIMAGE_PATH_LIKE_ENV_KEYS = [
+  "PATH",
+  "LD_LIBRARY_PATH",
+  "XDG_DATA_DIRS",
+  "GSETTINGS_SCHEMA_DIR",
+] as const;
 
 function isPathSegmentUnderAppDir(segment: string, appDir: string): boolean {
   return segment === appDir || segment.startsWith(`${appDir}/`);