Bug 1735294 [Wayland] Don't move wayland popups at nsWindow::Create() r=jhorak

Differential Revision: https://phabricator.services.mozilla.com/D128189

widget/gtk/nsWindow.cpp

@@ -5487,10 +5487,12 @@ nsresult nsWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
         // We need realized mShell at NativeMoveResize().
         gtk_widget_realize(mShell);
 
-        // With popup windows, we want to control their position, so don't
-        // wait for the window manager to place them (which wouldn't
-        // happen with override-redirect windows anyway).
-        NativeMoveResize(/* move */ true, /* resize */ false);
+        if (GdkIsX11Display()) {
+          // With popup windows, we want to control their position, so don't
+          // wait for the window manager to place them (which wouldn't
+          // happen with override-redirect windows anyway).
+          NativeMoveResize(/* move */ true, /* resize */ false);
+        }
       } else {  // must be eWindowType_toplevel
         mGtkWindowRoleName = "Toplevel";
         SetDefaultIcon();
@@ -5923,6 +5925,7 @@ void nsWindow::NativeMoveResize(bool aMoved, bool aResized) {
       NativeShow(false);
     }
     if (aMoved) {
+      LOG(("  moving to %d x %d", topLeft.x, topLeft.y));
       gtk_window_move(GTK_WINDOW(mShell), topLeft.x, topLeft.y);
     }
     return;