Review-request: Fix infinite loop caused by variable-refresh

[Sebastian Sauer]

Hi,

attached patch fixes the infinite loop with the document attached to comment 
#3 in https://bugs.kde.org/show_bug.cgi?id=260219 .

The idea is to not include the previous and next root-areas and mark them 
dirty if charsAdded and charsRemoved ==0 what means no characters where 
changed. In such a case we can assume that the change is related to the 
current root-area only.
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