I cannot seem to change the TileMap's grid/cell size in Godot 3.1
steps to reproduce:
2d node, add a TileMap. In the TileMap Inspector, Mode is square.
Under Cell, set the x & y size to 16 (or whatever you want). Click on Tile Set in inspector and choose "New Tileset". Click it to get to the editor.
Now add your graphic with the '+' at the bottom.
A grid shows up that has nothing to do with the cell size I selected above.
Perhaps cell size has nothing to do with the grid in the TileSet? How do I change this grid? I can change cell size settings to anything I want and the grid in the TileSet does not change (tried deleting the graphic, re-adding, deleting the TileSet then changing the cell size then re-adding. Nothing seems to change the grid/cell size in the TileSet editor. Help!
Also, is there anyway to include a grid offset? Gutter between the tiles?