I won’t add this feature, because it’s not simple or easy.
Mirroring an image is easy because you can mirror all pixels. But for mirroring tilemaps, it’s not the same. What I would need then is a mirrored version of all the tilesets. Because if you use the same tiles in the mirrored tilemap, it looks all wrong (a top left corner will remain a top left corner, but will now be on the right, a chair facing the room will now face the wall, etc.). Therefore each tile needs a mirrored version.
It is technically possible, but I don’t think it’s worth the effort.
There is another thing of course. Would it almost make it as good if we had the following tools for tiles?
- Flood filling tiles
- Rectangle tool
- paint tool (just hold the mouse button instead of clicking each time)
- Line tool