[Libreoffice-bugs] [Bug 127963] New: Toolbar flickers while the window is resized

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=127963

            Bug ID: 127963
           Summary: Toolbar flickers while the window is resized
           Product: LibreOffice
           Version: 6.2.6.2 release
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: UI
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: alexleduc at gmail.com

Description:
Resizing a window in any of the Libre Office programs (Calc, Writer, etc).
makes the toolbar icons and widget disappear and reappear every few
milliseconds, like a stroboscope. It makes the UI look buggy and contributes to
the perception that Libre Office is slow compared to MS Office.

This happens to every type of toolbar display. i.e. Select: 
"View -> User Interface -> Sidebar" from the menu and then resize the window
and not only will the toolbar flicker but everything in the sidebar.

To be clear: the flickering happens only while you click the edge of the window
and move the mouse to resize it. The flickering stops when you let go of the
mouse button.

Steps to Reproduce:
1. Open any of the Libre Office apps, like Writer, Calc, etc.
2. Click the edge of the window to resize it.
3. While you are moving your mouse during resize, notice the toolbar icons and
widgets flickering really fast.

Actual Results:
Toolbar(s) flickers while the window is resized

Expected Results:
I expect it to not flicker, just like every other application I use on Windows.


Reproducible: Always


User Profile Reset: No



Additional Info:
Note: Enabling OpenGL rendering seems to fix the flickering issue, however
since it is not enabled by default, I would argue that this is still an
important bug to fix because it affects the user experience negatively and
contributes to the perception the Libre Office is buggy. Every user is likely
to notice it since resizing a window is a common thing people do.

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