Do not hide virtual keyboard if the focused node is editable
Fixes https://github.com/ubports/morph-browser/issues/468
Upstream patch for QTBUG-91257 was filed on Qt's Gerrit: https://codereview.qt-project.org/c/qt/qtwebengine/+/337274
I've backported it for QWE 5.14.2 here.
The CI build was canceled because CI is really busy right now. I allowed build-source to complete to verify that the patches applied. We can wait for a full build to test if you like. A similar patch built before in xenial_-_qtwebengine-keyboard-hiding
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