Update stremio-linux-shell to use unstable for Rust 1.92+

roles/kodi/default.nix

@@ -22,7 +22,7 @@ in
     stremioScaleFactor = mkOption {
       type = types.nullOr types.float;
       default = null;
-      description = "Scale factor for Stremio UI via --force-device-scale-factor (e.g., 2 for 200% scaling)";
+      description = "Scale factor for Stremio UI via GDK_BACKEND=x11 + GDK_SCALE (e.g., 2.0 for 200% scaling). Forces XWayland mode since GTK4 ignores GDK_SCALE on native Wayland.";
     };
     appLauncherServer = {
       enable = mkOption {
@@ -70,6 +70,22 @@ in
       }
       else pkgs.qt-pinned.jellyfin-media-player;
 
+    # stremio-linux-shell is a GTK4/libadwaita + WebKitGTK app (not Electron/CEF).
+    # --force-device-scale-factor is a Chromium flag that it ignores entirely.
+    # On Wayland, GTK4 reads scale from the compositor via wp_fractional_scale_v1.
+    # To force a specific scale, we use GDK_BACKEND=x11 + GDK_SCALE which works
+    # reliably under XWayland. On native Wayland, GDK_SCALE is ignored.
+    # Format floats cleanly: 2.0 -> "2", 1.5 -> "1.5"
+    stremioScaleStr = let
+      sf = cfg.stremioScaleFactor;
+      intPart = builtins.floor sf;
+      s = builtins.toString sf;
+      m = builtins.match "([0-9]+)\\.([0-9]*[1-9])0*" s;
+      gdkScale = builtins.toString intPart;
+    in if sf == intPart then builtins.toString intPart
+       else if m != null then (builtins.elemAt m 0) + "." + (builtins.elemAt m 1)
+       else s;
+
     stremioPkg =
       if cfg.stremioScaleFactor != null
       then pkgs.symlinkJoin {
@@ -80,14 +96,15 @@ in
           mkdir -p $out/bin
           rm -f $out/bin/stremio
           makeWrapper ${pkgs.stremio-linux-shell}/bin/stremio $out/bin/stremio \
-            --add-flags "--force-device-scale-factor=${toString cfg.stremioScaleFactor}"
+            --set GDK_BACKEND x11 \
+            --set GDK_SCALE ${builtins.toString (builtins.floor cfg.stremioScaleFactor)}
 
-          # Update .desktop file to include scale factor
+          # Update .desktop file to force XWayland + GDK_SCALE for scaling
           mkdir -p $out/share/applications
           rm -f $out/share/applications/com.stremio.Stremio.desktop
           substitute ${pkgs.stremio-linux-shell}/share/applications/com.stremio.Stremio.desktop \
             $out/share/applications/com.stremio.Stremio.desktop \
-            --replace-fail "Exec=stremio" "Exec=stremio --force-device-scale-factor=${toString cfg.stremioScaleFactor}"
+            --replace-fail "Exec=sh -c " "Exec=env GDK_BACKEND=x11 GDK_SCALE=${builtins.toString (builtins.floor cfg.stremioScaleFactor)} sh -c "
         '';
       }
       else pkgs.stremio-linux-shell;