Description:
When OpenGl is activated in a sheet document with text rotated by 90° this text is not alwys displayed correctly, when the display changes, e.g. when zoom factor is changed or when a filter is set or deleted or when display is changed between normal window and full screen.
When OpenGL is disabled the problem doesn't exist.
The error occurs more or less randomly, i.e. e.g. at a certain zoom factor the text may be displayed correctly or not.

Steps to Reproduce:
1. Open the sheet document "Alte Fotoapparate_Test_klein_3.ods" (will be added)
2. Change the zoom factor (zoom in and out) and/or switch between normal window and full screen and/or set a filter an/or change it and/or select all
3. Look if display of the rotated text in the header lines changes

Actual Results:
When the display is changed (zoom factor, window size, selected cells) the rotated text may be displayed correctly but occasionally resp. often it is displayed not correctly, i.e. not all is displaed or nothing or only "dots". Screenshots will be added.

Expected Results:
The rotated text is always displayed correctly.


Reproducible: Sometimes


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
The behavier could not be reproduced with LO 6.0 and LO 6.1 until 6.1.2.1.
First I have seen it in LO 6.1.3.1., but it can be reproduced also with earlier builds of LODev 6.1.3 from 10/2018 and LODev 6.1.4 and LODev. 6.2.