[gnome-shell] screenshot: Only enable window screenshots when allowed by mode

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

commit f9135cdc86bf64718e6d0f6f4747347d4ed4c388
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Aug 21 21:07:52 2022 +0200

    screenshot: Only enable window screenshots when allowed by mode
    
    We currently don't take the session mode's `hasWindows` property
    into account when deciding whether window screenshots should be
    allowed. Right now that doesn't matter in practice, because all
    the ways to bring up the screenshot UI are blocked in those modes
    anyway. This is about to change though, so take the property into
    account to prevent an information leak.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2439>

 js/ui/screenshot.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/screenshot.js b/js/ui/screenshot.js
index d82d7a7a62..e6ead61273 100644
--- a/js/ui/screenshot.js
+++ b/js/ui/screenshot.js
@@ -1469,7 +1469,9 @@ var ScreenshotUI = GObject.registerClass({
             }
 
             this._windowButton.reactive =
-                windows.length > 0 && !this._castButton.checked;
+                Main.sessionMode.hasWindows &&
+                windows.length > 0 &&
+                !this._castButton.checked;
             if (!this._windowButton.reactive)
                 this._selectionButton.checked = true;