Compare calculation for the compare editor done all the time

Looks like the compare editor calculdates its deltas even if not visible in foreground.

To verify:

1.) Do a change to a larger text and displays its delta via the compare editor
2.) Ensure the compare editor is not visible
3.) Perform changes in other files and save -> Frequently you see "Calculating deltas" in the job monitor
4.) Change the file itself in a regular editor -> -> Frequently you see "Calculating deltas" in the job monitor

For one of my clients this compare calculation blocks frequently the flow, it seems blocking or really slowing down the UI. Unfortunately no freeze report is created. To make the UI usable again, we have to find each compare editor and close it.