Changes view: remember "Ignore Whitespace" option also for local files

When traversing changes either in working tree or stage, SmartGit resets "Ignore Whitespace" toggle after switch to next file back to default state which is untoggled.

This is to emphasise not missing unexpected or other kind of important w/s changes.

However from time to time one would need to traverse files quickly, to skim through changes at glance which is often not possible when w/s are highlighted.

I'm unsure how to approach the solution. E.g.: low lever setting for reset behavior, put it to hamburger menu of diff window, diff setting, double click on toggle would make it permanent, …