wayland: Don't perform hit testing during implicit pointer grabs

Skip hit testing when an implicit grab is active, or button raise events may be lost, and the cursor icon may be improperly set if the client reports hit test results while the pointer is outside the window bounds.

src/video/wayland/SDL_waylandevents.c

@@ -670,7 +670,8 @@ static void pointer_dispatch_absolute_motion(SDL_WaylandSeat *seat, bool warp)
             Wayland_SeatUpdatePointerGrab(seat);
         }
 
-        if (window->hit_test) {
+        // Don't perform hit testing if an implicit grab is active.
+        if (!(window->flags & SDL_WINDOW_MOUSE_CAPTURE) && window->hit_test) {
             SDL_HitTestResult rc = window->hit_test(window, &seat->pointer.last_motion, window->hit_test_data);
 
             // Apply the toplevel constraints if the window isn't resizable from those directions.
@@ -984,14 +985,14 @@ static void pointer_dispatch_button(SDL_WaylandSeat *seat, Uint8 sdl_button, boo
 
         if (down) {
             seat->pointer.buttons_pressed |= SDL_BUTTON_MASK(sdl_button);
+
+            if (sdl_button == SDL_BUTTON_LEFT && Wayland_ProcessHitTest(seat, seat->last_implicit_grab_serial)) {
+                return; // don't pass this event on to app.
+            }
         } else {
             seat->pointer.buttons_pressed &= ~SDL_BUTTON_MASK(sdl_button);
         }
 
-        if (sdl_button == SDL_BUTTON_LEFT && Wayland_ProcessHitTest(seat, seat->last_implicit_grab_serial)) {
-            return; // don't pass this event on to app.
-        }
-
         // Possibly ignore this click if it was to gain focus.
         if (window->last_focus_event_time_ns) {
             if (down && (SDL_GetTicksNS() - window->last_focus_event_time_ns) < WAYLAND_FOCUS_CLICK_TIMEOUT_NS) {