QTextEdit: Wrong cursor placement in lines consisting of spaces and a soft line break

In a line in QTextEdit that consists of spaces and ends with a soft line break (Shift+Return) the cursor sticks at the 2nd or 3rd col position. It does not move right even if more spaces are typed. When a character (e.g. 'a') is typed, the cursor jumps to the correct position and the problem is gone. If the character is deleted the issue comes back.

Reproduction: Open the Qt textedit demo and place the cursor into an empty line. Press Shift+Return to create a new line using a soft line break. Go up one line and type some spaces. Note that the cursor stops moving after 2 or 3 spaces.

This worked fine in Qt 4.7.1