+++ ./hw/xwayland/xwayland-output.c	2019-06-28 18:22:41.910491315 +0300
@@ -171,6 +171,47 @@
         return 25.4 / DEFAULT_DPI;
 }
 
+static int
+xwl_set_pixmap_visit_window(WindowPtr window, void *data)
+{
+    ScreenPtr screen = window->drawable.pScreen;
+
+    if (screen->GetWindowPixmap(window) == data) {
+        screen->SetWindowPixmap(window, screen->GetScreenPixmap(screen));
+        return WT_WALKCHILDREN;
+    }
+
+    return WT_DONTWALKCHILDREN;
+}
+
+static void
+update_backing_pixmaps(struct xwl_screen *xwl_screen, int width, int height)
+{
+    ScreenPtr pScreen = xwl_screen->screen;
+    WindowPtr pRoot = pScreen->root;
+    PixmapPtr old_pixmap, new_pixmap;
+
+    old_pixmap = pScreen->GetScreenPixmap(pScreen);
+    if (old_pixmap)
+        pScreen->DestroyPixmap(old_pixmap);
+    new_pixmap = pScreen->CreatePixmap(pScreen, width, height,
+                                       pScreen->rootDepth,
+                                       CREATE_PIXMAP_USAGE_BACKING_PIXMAP);
+    pScreen->SetScreenPixmap(new_pixmap);
+
+    if (old_pixmap)
+        TraverseTree(pScreen->root, xwl_set_pixmap_visit_window, old_pixmap);
+
+    old_pixmap = pScreen->GetWindowPixmap(pRoot);
+    if (old_pixmap)
+        pScreen->DestroyPixmap(old_pixmap);
+    new_pixmap = pScreen->CreatePixmap(pScreen, width, height,
+                                       pScreen->rootDepth,
+                                       CREATE_PIXMAP_USAGE_BACKING_PIXMAP);
+    pScreen->SetWindowPixmap(pRoot, new_pixmap);
+    pScreen->ResizeWindow(pRoot, 0, 0, width, height, NULL);
+}
+
 static void
 update_screen_size(struct xwl_output *xwl_output, int width, int height)
 {
@@ -180,6 +221,9 @@
     if (xwl_screen->root_clip_mode == ROOT_CLIP_FULL)
         SetRootClip(xwl_screen->screen, ROOT_CLIP_NONE);
 
+    if (!xwl_screen->rootless && xwl_screen->screen->root)
+        update_backing_pixmaps (xwl_screen, width, height);
+
     xwl_screen->width = width;
     xwl_screen->height = height;
     xwl_screen->screen->width = width;