Fixed flashing text issue, moved textbox to window layer.

src/conversation/textbox.c

@@ -77,6 +77,8 @@ void conversationTextboxSetText(char *text) {
   // Now we have organized the string nicely we can prep for rendering. Fill the
   // tiles with blank chars.
   textboxFillBlank();
+  WY_REG = TEXTBOX_WINDOW_Y * TILE_HEIGHT;
+  SHOW_WIN;
 }
 
 inline void textboxFillBlank() {
@@ -86,8 +88,8 @@ inline void textboxFillBlank() {
     tiles, TEXTBOX_WIDTH_IN_TILES, TEXTBOX_HEIGHT_IN_TILES, SPRITE_TILESET_WHITE_HIGH
   );
 
-  spriteBufferBackgroundHigh(
-    0x00, TEXTBOX_WIN_Y,
+  spriteBufferWindow(
+    0x00, TEXTBOX_Y,
     TEXTBOX_WIDTH_IN_TILES, TEXTBOX_HEIGHT_IN_TILES,
     tiles
   );
@@ -108,6 +110,7 @@ inline void conversationTextboxUpdate() {
       if((TEXTBOX_ROW_COUNT - TEXTBOX_ROW_CURRENT) < TEXTBOX_TILES_ROWS) {
         TEXTBOX_STATE &= ~TEXTBOX_STATE_VISIBLE;
         HIDE_WIN;
+        LCDC_REG |= LCDCF_BG8000;
         conversationQueueNext();
         return;
       }
@@ -129,9 +132,9 @@ inline void conversationTextboxUpdate() {
   } else {
     tile = spriteFontTileFromChar(c);
 
-    spriteBufferBackgroundHigh(
+    spriteBufferWindow(
       0x01 + (TEXTBOX_SCROLL % TEXTBOX_CHARS_PER_ROW),
-      TEXTBOX_WIN_Y + 0x01 + (TEXTBOX_SCROLL / TEXTBOX_CHARS_PER_ROW),
+      TEXTBOX_Y + 0x01 + (TEXTBOX_SCROLL / TEXTBOX_CHARS_PER_ROW),
       1, 1,
       &tile
     );