Editor: undo/redo doesn't work when placing terrains in one move

[kaputtnik]

- Start Editor
- Select a terrain
- Place the terrain, keep left mouse button down and move over the map
- Do it again with another type of terrain
- Use "undo"

-> Only the first "in one move" placed terrain triangle get removed
-> Clicking undo again removes the first placed triangle of the first move
-> "undo" works only for some steps to such placed terrain
-> "redo" works also only some steps then

Don't know when this comes in, but earlier clicking "redo" removes all terrains which was placed "in one move".

This happens only to terrains. For Immovables it works correct.

[kaputtnik (franku)]

Seems r7764 is the culprit: http://bazaar.launchpad.net/~widelands-dev/widelands/trunk/revision/7764

I checked this through reverting and testing. In r7763 it works correct.

Don't know why moving folders has such side effects though.

[GunChleoc (gunchleoc)]

Thanks for tracking down the offending commit, that made it very easy to fix :)

[GunChleoc (gunchleoc)]

Fixed in build19-rc1.