SUMMARY On a new build of Breeze GTK, it uses the circled closed button by default which is no longer a default for the Qt theme. The issue mostly impacts running Breeze on non-KDE environments and inside flatpak where it can't access the window_decorations.css and svg files in .config/gtk-3.0 folder.
Git commit a5a8217dab3af69e925068ea68bcc4cd4a75fb55 by Janet Blackquill. Committed on 11/02/2022 at 18:18. Pushed by cblack into branch 'master'. assets: uncircle the close button's idle state This is the new default in Breeze. M +1 -1 src/assets/breeze-close-symbolic.svg https://invent.kde.org/plasma/breeze-gtk/commit/a5a8217dab3af69e925068ea68bcc4cd4a75fb55
Git commit 285585f751af96f7febcf979898ab5d59e96751a by Nate Graham, on behalf of Janet Blackquill. Committed on 12/02/2022 at 04:29. Pushed by ngraham into branch 'Plasma/5.24'. assets: uncircle the close button's idle state This is the new default in Breeze. (cherry picked from commit a5a8217dab3af69e925068ea68bcc4cd4a75fb55) M +1 -1 src/assets/breeze-close-symbolic.svg https://invent.kde.org/plasma/breeze-gtk/commit/285585f751af96f7febcf979898ab5d59e96751a
*** Bug 446497 has been marked as a duplicate of this bug. ***
*** Bug 453167 has been marked as a duplicate of this bug. ***
Re-opening; per Bug 453167, it seems to not be fixed.
(In reply to Nate Graham from comment #5) > Re-opening; per Bug 453167, it seems to not be fixed. It's not the same bug. We rely on Breeze-GTK to inject kwin's button appearance so they look well. Adwaita doesn't have those tricks and uses default icon from Breeze icon set.
OK, thanks.