#8 Transparent pixels of isometric tiles rendered opaquely

[Delano]

Isometric tiles are not drawn transparently, if they contain parts that should be transparent. To reproduce:

1. Create an isometric board in the editor.
2. Lay some tiles (.tst or .iso) on layer 1.
3. Lay tiles with transparent sections on layer 2, over the tiles on layer 1. Parts of the tiles on layer 1 will still be visible in the board editor.
4. Test run the board. The transparent parts of the tiles on layer 2 are rendered opaquely and the tiles on layer 1 cannot be seen.

[swallowtailed]

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Some additional infomation on this bug based on a test board I've got set up :
the 'transparent' areas on the affected tiles flick between the boards background colour and the transparent colour (pink/purple) as you move around the board. The renderer only seems to render the tile on the highest layer in this mode - such that if I have a transparent tile on layer 3, the tiles on 1 and 2 are never visible at runtime.