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

[Marge Bot <marge-bot src gnome org>]

commit 6a4e70f1070878d3e1c5963727eb45216ec6b8e0
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
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2281>

 js/ui/overview.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/overview.js b/js/ui/overview.js
index 96ccde5219..7f8e85e36b 100644
--- a/js/ui/overview.js
+++ b/js/ui/overview.js
@@ -448,8 +448,13 @@ 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;