https://bugs.documentfoundation.org/show_bug.cgi?id=112590

--- Comment #27 from Rico Tzschichholz <[email protected]> ---
I would suspect that being a regression caused by

commit 159f55eab59d5a01973e5ea79f9109d25e5dac31
Author: Caolán McNamara <[email protected]>
Date:   Sun Sep 10 16:07:49 2017 +0100

    gtk3: flicker-free opengl transitions

    leave the GtkGLArea opengl context alone except for the final render into
it,
    create a new context for the slide transitions to play with

    set up a pair of framebuffers, a scratch one to let the transitions render
    into, the other to take a snapshot when the transition is finished with it
and
    then tell GtkGLArea we're ready to render it and when the callback comes
around
    copy the snapshot into it.

    Change-Id: I3515614baf7eea0ff53c46edbaf9cf66f926eef2

    hidpi+gtk3: move setting the opengl slide viewport

    to when the window size is set, and adjust to gtk3 hidpi
    scaling factor


https://gerrit.libreoffice.org/#/c/42143/
https://gerrit.libreoffice.org/#/c/42153/

https://cgit.freedesktop.org/libreoffice/core/commit/?h=libreoffice-5-4-2&id=159f55eab59d5a01973e5ea79f9109d25e5dac31

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