[Linux] Show preview contents for minimized windows

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 1fd497f8b0197acafe82684fec3ffbc2739a1352..f2f7141a81d60de19d892316d344a4966d328406 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -1246,10 +1246,13 @@ void DesktopWindowTreeHostX11::OnWMStateUpdated() {
   // SetBounds() does not work.
   bool is_minimized = IsMinimized();
   if (is_minimized != was_minimized) {
-    if (is_minimized)
+    if (is_minimized) {
+      compositor()->SetBlockDrawing(true);
       content_window_->Hide();
-    else
+    } else {
       content_window_->Show();
+      compositor()->SetBlockDrawing(false);
+    }
   }
 
   if (restored_bounds_.IsEmpty()) {