Krunner randomly forces you to backspace-remove text to clear out text

Submitted here too: 
https://bugs.kde.org/show_bug.cgi?id=485375

SUMMARY

I have to manually hit backspace to remove text from krunner. 

expected behavior: it should just clear out text or have it highlighted to
allow for "write over" so that the new text I enter wipes out old text.  

Hard to reproduce, not sure what triggers it because it doesn't happen all the
time...but I think its when I highlight text. 

1. Highlight some random text from web browser
2. Call krunner 
3. Observe behavior
4. esc and call krunner again, and NOW it highlights all the text for
overwrite....which should be intended behavior initially.  

DEMO of the problem:

Hard to explain, so here is a vid:
 https://youtu.be/0WtkuhZGlEs