Wayland: Fix fallback decoration cursor updating

When a click through to the fallback decorations caused the end of
a modal like the window menu, the cursor shape would not be updated
until the next time the cursor moved.

This commit adds an update of the cursor for the pointer enter event for
fallback decoration surfaces, in addition to the updates at pointer
motion events.

README.md

@@ -140,6 +140,8 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: Fallback decorations would report scroll events
  - [Wayland] Bugfix: Keyboard repeat events halted when any key is released (#2568)
  - [Wayland] Bugfix: Fallback decorations would show menu at wrong position
+ - [Wayland] Bugfix: The cursor was not updated when clicking through from
+   a modal to a fallback decoration
  - [X11] Bugfix: Running without a WM could trigger an assert (#2593,#2601,#2631)
  - [Null] Added Vulkan 'window' surface creation via `VK_EXT_headless_surface`
  - [Null] Added EGL context creation on Mesa via `EGL_MESA_platform_surfaceless`

src/wl_window.c

@@ -1542,7 +1542,10 @@ static void pointerHandleEnter(void* userData,
     else
     {
         if (window->wl.fallback.decorations)
+        {
             window->wl.fallback.focus = surface;
+            updateFallbackDecorationCursor(window, sx, sy);
+        }
     }
 }