'End' key does not work in large file

[michelkaporin]

Testing #30243.

1. Generate file as in Change all occurrences in a single 100MB line leads to a crash when autosave on #31545.
2. Click on the first line somewhere to see a cursor, press 'End' key on the keyboard.

Expectation: navigating to the end of the line.
Ctrl+End does not navigate to the end of the document also.

[alexdima]

Duplicate of #27380

For a non wrapped line, only the first 10k chars are painted. The cursor goes to the end, its just that the end is "not painted". Chromium crashes or freezes otherwise.