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Hack for -/+ key in volume column (some kb layouts)

Fixes issue #38

--- a/src/ft2_edit.c

+++ b/src/ft2_edit.c

@@ -118,7 +118,15 @@

 		}

 		if (i == KEY2VOL_ENTRIES)

-			i = -1; // invalid key for slot

+		{

+			// volume column key not found, let's try a hack for '-' and '+' keys first

+			if (scancode == SDL_SCANCODE_MINUS)

+				i = 5;

+			else if (scancode == SDL_SCANCODE_EQUALS)

+				i = 6;

+			else

+				i = -1; // invalid key for slot

+		}

 	}

 	else if (cursor.object == CURSOR_EFX0)

 	{