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ktexteditor crash opening a specific file

Tracked to file kateviewinternal.cpp, line 1415, hits this assert:
Q_ASSERT(thisLine.virtualLine() == virtualCursor.line());

I tried to open the file with another editor just to create a simplified version of it that I could send, and now I cannot trigger the assert anymore even with the original file, sigh.

how should I track this down?