Improvements for the map editor about unciv HOT 4 OPEN

Your first idea does seem practical. Think we've been looking for an undo function for a while, might happen one day. As for shapes, that doesn't seem practical since the brush can scale 1-5 tile radius, and you could potentially use another smaller size to carve into a bigger brush. Using combinations of brushes and floodfill you should be able to get the desired result.

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Map editor already has a long list of to-do's: https://github.com/yairm210/Unciv/blob/master/core/src/com/unciv/ui/screens/mapeditorscreen/MapEditorScreen.kt#L45-L60

... and back then I didn't even bother to write down the undo, seemed too costly to me. Back then the normal game didn't have undo either. Needs either a complete transaction system with rollback-able change descriptors, or a deep clone per undo level -> RAM. Or autosave each mini edit step to disk...
Shaped brushes - far too complicated. As you can see I had thought of a "hexagonal copy-paste" brush type...

But the first todo is more important and unless someone deals with that first (and it doesn't seem like a fun pastime to me either atm), I'd vote against any other changes.

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So is it infeasible to retain the last map click action and pass that back as a forward-motion negation of the same action?

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Actually, that sounded like a good idea, til loss of tile info wouldn't be restored. Just Gotta Do It Right

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