SUMMARY
***
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***


STEPS TO REPRODUCE
1.  I open CSV file which has 1,5GB size
2.  I select from 3rd line via shift + down arrow almost whole file content
3.  I click delete to delete most of the file content


OBSERVED RESULT
kate crashes, when i try to delete line by line it won't crashes, only when almost all of 1,5GB content is selected (3rd line to end of file)

EXPECTED RESULT
kate won't crash

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION