[Libreoffice-bugs] [Bug 143334] New: qt5/kf5: Broken rendering e.g. after using Calc's Borders toolbar item

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=143334

            Bug ID: 143334
           Summary: qt5/kf5: Broken rendering e.g. after using Calc's
                    Borders toolbar item
           Product: LibreOffice
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: m.weghorn at posteo.de

Created attachment 173530
  --> https://bugs.documentfoundation.org/attachment.cgi?id=173530&action=edit
Screencast

Steps to reproduce:

0) use qt5 or kf5 VCL plugin (SAL_USE_VCLPLUGIN=qt5 or SAL_USE_VCLPLUGIN=kf5) 
1) start LO Calc
2) in the formatting toolbar, open the "Borders" popup (either by mouse klick
or using keyboard)
3) Click e.g. on the second item in the list ("Set left border only")
4) Press "Alt"

Result:

in step 3: Rendering is broken, some areas no more painted
in step 4: Even more areas no more painted

The attached screenshot shows the problem.

Version: 7.3.0.0.alpha0+ / LibreOffice Community
Build ID: 0fc020fb73c86a20608e8dff12af607e60327379
CPU threads: 12; OS: Linux 5.10; UI render: default; VCL: kf5 (cairo+xcb)
Locale: en-GB (en_GB.UTF-8); UI: en-US
Calc: threaded

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