[gnome-shell/wip/carlosg/overview-during-grab-op] overview: Avoid entering in overview mode during display grab op

[Carlos Garnacho <carlosg src gnome org>]

commit 9bc5db2e856afba5f7b8cf3e04c7ed5c73232df5
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Apr 26 13:09:01 2022 +0200

    overview: Avoid entering in overview mode during display grab op
    
    ClutterGrab and display grab operations are pretty much mutually
    exclusive, but there's no mechanism to ensure a ClutterGrab does
    not step on top of an existing grab operation.
    
    This looks the only place that could trigger that (e.g. start
    dragging window, then move pointer to top/left corner), so skip
    over the situation here explicitly.
    
    Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5397
    Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5181

 js/ui/overview.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/overview.js b/js/ui/overview.js
index 96ccde5219..4e86860ca5 100644
--- a/js/ui/overview.js
+++ b/js/ui/overview.js
@@ -448,8 +448,14 @@ var Overview = class {
         if (this._shown) {
             let shouldBeModal = !this._inXdndDrag;
             if (shouldBeModal && !this._modal) {
-                let actionMode = Shell.ActionMode.OVERVIEW;
-                let grab = Main.pushModal(global.stage, { actionMode });
+                if (global.display.get_grab_op() !== Meta.GrabOp.NONE) {
+                    this.hide();
+                    return false;
+                }
+
+                const grab = Main.pushModal(global.stage, {
+                    actionMode: Shell.ActionMode.OVERVIEW,
+                });
                 if (grab.get_seat_state() !== Clutter.GrabState.NONE) {
                     this._grab = grab;
                     this._modal = true;