overview: Don't claim to be SHOWN when HIDDEN during startup animation

When the overview gets hidden during the startup animation, the callback
would still change the state to SHOWN, despite the overview not being
shown.

This can happen for example if a `monitors-changed` signal triggers a
relayout during startup.

See: https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2514#note_1683525
(cherry picked from commit bb42973730a1a96881cb63bf7c1e9fdc68fb9fba)

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2705>

1 files changed, 6 insertions, 0 deletions

diff --git a/js/ui/overview.js b/js/ui/overview.js
index 88451137c..254dc8edb 100644
--- a/js/ui/overview.js
+++ b/js/ui/overview.js
@@ -682,6 +682,12 @@ var Overview = class {
         this._changeShownState(OverviewShownState.SHOWING);
 
         this._overview.runStartupAnimation(() => {
+            // Overview got hidden during startup animation
+            if (this._shownState !== OverviewShownState.SHOWING) {
+                callback();
+                return;
+            }
+
             if (!this._syncGrab()) {
                 callback();
                 return;