Created attachment 113014 [details]
Image of bad drawing 1
see how KW are not highlighted on 2 first lines

I created a Mark Occurence Highlighter as per the tutorial
It worked pretty well up until version 7
Now the painting of the first elements is garbled
When I reverse the sequence of regions to highlight, it is the last tokens in the file to suffer
I spent 2 whole days on trying many tricks! none would do. 
It is a timing problem. 
Calling bag.addHighlight in invokeLater does not change anything.

The only stupid trick I found is to add a sleep(1ms), which I have difficulty to admit as a fix!

See images of garbled output

Thanks if you have any hint