Change all occurrences in a single 100MB line leads to a crash when autosave on

[michelkaporin]

Testing #30243.

32-bit Windows

0. Enable autosave.
1. Open 100MB file generated by Dummy File Creator (non-random content). I got single line generated.
2. Type 'sd' in several places on the same line.
3. Do an edit via 'Change all occurrences' from the context menu.
   Observe crash.

Should we disable triggering autosave for large files?

[alexdima]

A file with a single line of 100MB is a beast of its own and presents additional challenges than a file with 100MB distributed over multiple lines.