[client] app: allow selective full invalidation

Overlays only need to trigger a new frame if they have changed and not
full window invalidation, this change allows for this.

client/displayservers/Wayland/gl.c

@@ -123,7 +123,7 @@ void waylandEGLSwapBuffers(EGLDisplay display, EGLSurface surface, const struct
 
     app_handleResizeEvent(wlWm.width, wlWm.height, wl_fixed_to_double(wlWm.scale),
         (struct Border) {0, 0, 0, 0});
-    app_invalidateWindow();
+    app_invalidateWindow(true);
     waylandStopWaitFrame();
     wlWm.needsResize = false;
   }

client/displayservers/Wayland/shell_xdg.c

@@ -46,7 +46,7 @@ static void xdgSurfaceConfigure(void * data, struct xdg_surface * xdgSurface,
   {
     wlWm.needsResize  = true;
     wlWm.resizeSerial = serial;
-    app_invalidateWindow();
+    app_invalidateWindow(true);
     waylandStopWaitFrame();
   }
   else

client/displayservers/Wayland/window.c

@@ -48,7 +48,7 @@ void waylandWindowUpdateScale(void)
     wlWm.scale = maxScale;
     wlWm.fractionalScale = wl_fixed_from_int(wl_fixed_to_int(maxScale)) != maxScale;
     wlWm.needsResize = true;
-    app_invalidateWindow();
+    app_invalidateWindow(true);
     waylandStopWaitFrame();
   }
 }

client/displayservers/X11/x11.c

@@ -708,7 +708,7 @@ static int x11EventThread(void * unused)
 
       case Expose:
       {
-        app_invalidateWindow();
+        app_invalidateWindow(true);
         break;
       }