User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1
Build Identifier: 

Using standard keyboard combinations for highlighting text is instead inserting a TM result. 

Reproducible: Always

Steps to Reproduce:
1. Open existing translation in editor, putting the cursor at the end of the string.
2. Hold down Ctrl+Shift, then additionally press left arrow key.

Actual Results:  
The 4th TM match is being inserted into the editor. 

Expected Results:  
Holding down Ctrl+Shift, with each time I hit the left arrow key, he text should be highlighted word by word  -- this is standard text editor behaviour.

Severity medium/high because this behaviour is really unexpected, deletes existing translation inserting and approving a different translation, and there is no undo functionality any more to fix what happened.