Very high CPU usage when annotation (warning) is visible in the editor

The GUI thread maxes out a single CPU core when an annotation is visible in the editor.

Scrolling to an area without visible annotations makes the load go away.

Scrolling back to an annotation and the CPU is maxed out again.

Currently reproducing the behavior with Qt Creator 4.5 beta1 64 bit (Snapshot from Octorber 13).

I strongly suspect one of the TextEditor related commits on Octorber 9:

cf624f92bd3da7305afc70c6e440dab81fdf19f4

5fb310828eb04d373205fa48a949b6ccd10f68f4

26d0b536cabce93bd2564bdbea0233357c50c32a

c2686fd9ae3bc8ac1550984d88b59cb9a307c13a