Add basic undo/redo functionality #2
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This works by simply keeping backups the entire relevant state of the Wobbly project after each action and rolling back to such states on undo/redo. This is feasible since Wobbly's internal state is not very memory-intensive. A drawback is that all list or table models have to be repopulated from scratch, so selections in dialogs are cleared on every undo/redo. This could be improved later on by saving the UI state before a rollback and restoring it after it is completed. Fixes dubhater#15 .
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This works by simply keeping backups the entire relevant state of the Wobbly project after each action and rolling back to such states on undo/redo. This is feasible since Wobbly's internal state is not very memory-intensive.
A drawback is that all list or table models have to be repopulated from scratch, so selections in dialogs are cleared on every undo/redo. This could be improved later on by saving the UI state before a rollback and restoring it after it is completed.
Fixes dubhater#15 .