Mouse cursor is incorrect over the code sometimes

Sometimes, typically when I switch to another application and back to QtCreator with Alt+Tab, an incorrect mouse cursor icon is displayed when the mouse is over code in the editor. The cursor is a regular arrow, while normally it should be a vertical dash, like in normal text editors or input fields. The cursor does not change whet I move it over different elements of QtCreator interface, it always stays the regular arrow. The mouse actions are processed normally though, I can click and select text with mouse.

This is not consistently reproduced and I don't know the exact steps to make the problem appear. I did not encounter this problem with QtCreator 3.6.0 and I don't see the problem with other applications. I typically have to switch between different applications, like Firefox or other editors, and QtCreator and click around to make the cursor behavior back to normal.