This commit - 909cb3859b1b68408cbf71354c95b6bf39d15c12, which fixed
QTCREATORBUG-15038, also introduced a regression.
How to reproduce the regression:
If you have some text, for example `std::move(something)`:
- put cursor after `::`
- press Ctrl+Space (`ProposalWidget` should appear)
- press left arrow
The content of the window will NOT be adjusted/updated to the first letter, while it should. Essentially `ProposalWidget` seems to be just dead.
My experiments showed that restoring
in plugins/texteditor/codeassist/genericproposalwidget.cpp fixes the regression and does not re-introduce the bug described here -