[Breeze] [Bug 430943] New: KComboBox's KLineEdit drawn with no border at all when KComboBox::setEditable(true) is called on already visible widget

[phd]

https://bugs.kde.org/show_bug.cgi?id=430943

            Bug ID: 430943
           Summary: KComboBox's KLineEdit drawn with no border at all when
                    KComboBox::setEditable(true) is called on already
                    visible widget
           Product: Breeze
           Version: 5.20.4
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: QStyle
          Assignee: unassigned-bugs at kde.org
          Reporter: phd at phd.re
  Target Milestone: ---

Created attachment 134380
  --> https://bugs.kde.org/attachment.cgi?id=134380&action=edit
KFileWidget-X0.png

After this change 2f351fe1 [1] KComboBox's KLineEdit is drawn with no border at
all (see picture) when KComboBox::setEditable(true) is called on already
visible
KComboBox widget.

To reproduce you can apply this simple commit to pdabrowski/kio at 50d749cb [2] to
KIO and run KWrite (or anything), click Open to show KFileWidget, and then
press
Alt+AnyKey shortcut to make 'Type filter' KComboBox widget editable.
With 2f351fe1 [1] reverted the above works fine.

All other styles ("Oxygen", "Fusion", "MS Windows 9x") work fine.

Original bug report: https://invent.kde.org/plasma/breeze/-/issues/2

[1]
https://invent.kde.org/plasma/breeze/-/commit/2f351fe101d6a706b618b4f9518581006f50b242
[2]
https://invent.kde.org/pdabrowski/kio/commit/50d749cb8621c0707fba9a07f4c2e5e77d07f329

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