[0.4.0] Left + Right clicking while painting with the Tile Placer Tool will continue to paint tiles.

This is easy to replicate.

First, pick a mapped tile, then begin painting it while holding left mouse button.
While the left mouse button is held down, right click. Now let go of the left and right mouse buttons, and it will still be placing the chosen tile under your cursor.

You cannot 'undo' these tiles, either. :(