1. Open a dialog with Area tab, for example Writer - Format - Paragraph 2. Change the colour palette in the Area tab - you might have to change it as many as three times The width of the palettes area and the dropdown grow wildly. This is NOT seen with gtk3. Bibisected with linux-64-7.1 to https://git.libreoffice.org/core/commit/325faca502ffca43cf8cbb272fac2516bcb8eb55 tdf#134413 must add scrollbar width on turning it off to occupy the same space Adding Cc: to Caolán McNamara
Going from custom, html to tonal triggers it. Seems to be the same problem as bug 136737 *** This bug has been marked as a duplicate of bug 136737 ***