Cannot inline edit text in embedded designer when Qt Quick 2 is used in the application embedding it

In Qt Creator we embed .ui Designer. We also now use Qt Quick 2 for some parts of Qt Creator. Whenever one of these Qt Quick 2 parts was shown, it's no longer possible to inline edit text in .ui Designer (e.g. choose "Change text" from the context menu on a button). Pressing cursor keys then moves the widget instead of the text cursor, and "normal keys" also do not change the text.

Since Qt Creator's Welcome screen uses Qt Quick 2, that effect is usually what one sees. But if you e.g. start Qt Creator with Welcome plugin disabled:

1. as long as you don't switch to analyze mode/QML Profiler or qt quick designer, everything works just fine in .ui designer
2. after switching once to e.g. analyze mode (with QML Profiler selected), the above behavior kicks in