Checked Qt webengine source and the page action versions simply invoke the execCommand javascript versions, so the break is most likely in the chromium 3rdParty stuff.
That was just about the only changes in QtWebEngine from Qt 5.12.7 to Qt 5.12.8.
Qt 5.15 seems to be based on a newer Chromium 80? istead of 77, 78, or 79, so this may be a pure Chromium Bug.
Last edited by KevinH; 06-19-2020 at 05:43 PM.
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