Qt Creator cannot configure Ctrl+Shift+8 as keyboad shortcut

While trying to emulate Visual C++ and Visual Assist keyboard shortcuts I've noticed that Qt Creator 3.2.0 cannot set Ctrl+Shift+8 as "Visualize Whitespace".

Instead of Ctrl+Shift+8 the dialog captures Ctrl+Shift+*.

Unfortunately this is not just a display issue, after setting Ctrl+Shift+* as Ctrl+Shift+8 and then trying in the editor the command doesn't work.

Exporting all the keyboard shortcuts into a kms file, manually editing Ctrl+Shift+* to Ctrl+Shift+8 and importing back the kms file, the key combination works.

Looks like a bug in Qt / regression. This used to work see http://cristianadam.blogspot.de/2012/08/qt-creator-visual-c-keyboard-shortcuts.html