fix: overview scale survives client commits (Firefox pop-to-full-size)

wlroots' scene-surface commit listener resets a committed buffer's dest
size and opaque region to the surface's natural extent. The
last_applied_scale short-circuit in scale_only_render_finish then skipped
the per-frame reapply (output.rs render_and_commit) because the scale
itself hadn't changed, so any client repainting in overview — browser
animations, caret blink — popped back to full size and stayed there until
the next camera move. Drop the short-circuit: the pass runs only on frames
that will render, and every setter in it is change-checked, so an
already-correct tree produces no damage.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/server/window.rs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/server/window.rs b/src/server/window.rs
index 14bc19e..97ecaf3 100644
--- a/src/server/window.rs
+++ b/src/server/window.rs
@@ -2368,10 +2368,14 @@ impl Window {
             return;
         }
 
-        if self.scale == self.last_applied_scale {
-            return;
-        }
-
+        // No last_applied_scale short-circuit here: wlroots' scene-surface
+        // commit listener resets a committed buffer's dest size and opaque
+        // region to the surface's natural extent, so any client repainting
+        // while scaled (browser animations, caret blink) pops back to full
+        // size even though the cached scale says nothing changed. This runs
+        // per rendered frame (output.rs render_and_commit), after commits and
+        // before build_state, and every setter below is change-checked — an
+        // already-correct tree produces no damage.
         self.last_applied_scale = self.scale;
 
         struct ScaleData {