[libreoffice-users] style panel on the right "crashes"

Good evening
I just discovered something. Since I never did this before, I do not 
know, whether the problem is old or new.

1) Open document. existing or empty - it does not matter
2) click F11 to open the style/navigator etc. panel on the right
3) I pointed the cursor on the double line separating the panel from the 
text area and tried to drag it a little to the left
4) with the cursor on said double line, the cursor assumes the shape of 
a double line with arrows pointing in opposite directions
5) this operation then starts very fast and wild flickering mainly of 
the panel, but also the text area
    and the cursor remains forever in the shape of a double line with 
arrows pointing in opposite directions

The ONLY way of stopping this is Ctrl+Alt+Del -> Task manager -> force 
quite Libreoffice.

THAT cannot be normal.
Is there a way to avoid this behavior. It is obviously VERY disruptive!

Thank you
Thomas

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