nhmall 5ac96e9318 odd Windows lighting in lit rooms (issue #929) ...

bkglyph variable gets initialized to GLYPH_UNEXPLORED so ends
up being returned by get_bk_glyph() if something more interesting
wasn't chosen in the switch statement.

The Windows win32 interface will then use the tile mapped to
GLYPH_UNEXPLORED as a background. The tile is 16x16 all black
pixels. That looked very odd.

Treat GLYPH_UNEXPLORED as an out-of-range value.

Closes #929

2022-12-11 21:29:42 -05:00

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