Document main_menu state machine, name window constants

The new names for the constants (and newly named functions) give a much
better understanding of what the window system is trying to do.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/diploma.c b/src/diploma.c
index b3d5a48fa..9194af710 100644
--- a/src/diploma.c
+++ b/src/diploma.c
@@ -197,7 +197,7 @@ static void InitDiplomaWindow(void)
     InitWindows(sDiplomaWinTemplates);
     DeactivateAllTextPrinters();
     LoadPalette(gUnknown_0860F074, 0xF0, 0x20);
-    FillWindowPixelBuffer(0, 0);
+    FillWindowPixelBuffer(0, PIXEL_BUFFER_TRANSPARENT);
     PutWindowTilemap(0);
 }