Sam Atkins 4f9f948b6d LibGUI: Support "modified" window state in SettingsWindow ...

SettingsWindow now notices if the window is marked as modified, and
shows a confirmation pop-up to check if the user wants to apply or
discard their changes. It automatically marks the window as unmodified
after restoring defaults or applying the changes, but each Tab subclass
needs to call `set_modified(true)` when the user modifies things.

The "Apply" button is automatically disabled when there are no unsaved
changes to be applied.

2022-05-12 13:10:49 +02:00

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