Ability to undo or restore changes to the preferences

[waldyrious]

Is your feature request related to a problem? Please describe. I sometimes experiment with making changes in the Preferences window, to see how the various options look/work, and I may not not remember to memorize the previous setting prior to the changes, and then be unsure how to restore the previous state.

Describe the solution you'd like It would be awesome if there was also an "Undo" button (and maybe a "Redo" button as well?), similar to the back/forward history buttons in browsers, text editors, etc. This would allow reverting the last change done in the current view of the Preferences window. There's no need to persist a full log of changes after the Preferences window is closed (or even as one changes between tabs of the preferences window), but both additions would be welcome as well! :D

Describe alternatives you've considered Maybe a way to restore each preference to its default setting would be nice too. But I'm not sure how that could be implemented without cluttering the UI.

Another option would be an additional button next to "Close" in the bottom right of the Preferences button, labeled "Close without saving", or "Discard changes", or something like that. This would undo all the changes made since the Preferences window was opened.