[kde] [Bug 464167] New: Adding titlebar on borderless GTK subwindow puts empty gaps

[David]

https://bugs.kde.org/show_bug.cgi?id=464167

            Bug ID: 464167
           Summary: Adding titlebar on borderless GTK subwindow puts empty
                    gaps
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: david.cortes.rivera at gmail.com
  Target Milestone: ---

Created attachment 155221
  --> https://bugs.kde.org/attachment.cgi?id=155221&action=edit
evolution_strange_border

SUMMARY
If I launch evolution (GTK email client which doesn't use the regular titlebar
and window buttons as most other apps) and configure the window rules to
forcefully make it use a titlebar, when it opens a subwindow to reply to an
email, it will add a titlebar to it, but along the way will add extra empty
transparent spacing throughout all 4 borders of the window (see attached
screenshot), which looks very weird, instead of just drawing the titlebar above
the usual subwindow without spacing in the way.

STEPS TO REPRODUCE
1. Launch evolution.
2. Right-click the titlebar and select 'More Actions' -> tick **off** 'No
Border' (alternatively, could be set to draw a titlebar in the window rules as
it's currently worded a bit differently there).
3. Configure evolution to access you email.
4. Select some random email inside evolution, right-click it, and select 'Reply
to Sender'.
5. Look at the borders in the newly opened subwindow.

OBSERVED RESULT
Has empty space extending across the borders, and there's a gap between the
GTK-drawn subwindow and the KDE-drawn titlebar.

EXPECTED RESULT
Should put a titlebar above the GTK-drawn subwindow, without extra spaces and
without having a gap between the window and the titlebar.

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Kernel Version: 5.18.0-4-amd64 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 2700 Eight-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: AMD Radeon RX Vega
Manufacturer: Acer
Product Name: Predator PH517-61
System Version: V1.09

ADDITIONAL INFORMATION

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