Description of problem:
If an iBus Input Method is installed, dead keys or Compose key cease to respond in Qt software no matter if iBus is activated or not, while GTK apps are not affected

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Install an input method for iBus and a language that requires dead or compose keys
2. Open a Qt app
3. Type special characters
  
Actual results:
´α ´ε ´ι ´ο (Greek, letter+[;])
,c `e /o (Extended latin, compose)

Expected results:
ά έ ί ό
ç è ø 

Additional info:
Running the app with root rights "solves" the problem.