https://bugs.kde.org/show_bug.cgi?id=417856

            Bug ID: 417856
           Summary: Panel background unhidden before Firefox CSD window
                    visually touches
           Product: lattedock
           Version: 0.9.8.1
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: application
          Assignee: mvourla...@gmail.com
          Reporter: prettyvani...@posteo.at
  Target Milestone: ---

Created attachment 126152
  --> https://bugs.kde.org/attachment.cgi?id=126152&action=edit
Firefox with CSDs close to the panel

SUMMARY

With "Hide background when not needed" enabled on my latte panels the
backgrounds stay hidden as expected when I have a Firefox window with normal
KWin decorations until it actually touches or Firefox is maximized. When using
Firefox with CSDs Latte behaves as if there was an invisible larger border
around Firefox' window and becomes opaque quite a bit before it visibly
touches.
Maybe this has to do with the changes in Plasma 5.18 re better support for GTK
client-side decorations with shadows and resize areas?

STEPS TO REPRODUCE
1. Set a panel to "Hide background when not needed" that is otherwise opaque.
2. Configure Firefox to not use a "Title Bar" in its "Customize" view, thereby
making it a client-side decorated window.
3. Observe the latte panel becoming opaque before Firefox visibly touches or is
maximized.

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.18.0
KDE Frameworks Version: 5.67.0
Qt Version: 5.14.1

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