More battle doc, add battle window ids

src/battle_controller_link_opponent.c

@@ -29,9 +29,6 @@
 #include "constants/trainers.h"
 #include "recorded_battle.h"
 
-extern struct MusicPlayerInfo gMPlayInfo_BGM;
-
-// this file's functions
 static void LinkOpponentHandleGetMonData(void);
 static void LinkOpponentHandleGetRawMonData(void);
 static void LinkOpponentHandleSetMonData(void);
@@ -424,7 +421,7 @@ static void FreeMonSpriteAfterSwitchOutAnim(void)
 
 static void CompleteOnInactiveTextPrinter(void)
 {
-    if (!IsTextPrinterActive(0))
+    if (!IsTextPrinterActive(B_WIN_MSG))
         LinkOpponentBufferExecCompleted();
 }
 
@@ -1471,7 +1468,7 @@ static void LinkOpponentHandlePrintString(void)
     gBattle_BG0_Y = 0;
     stringId = (u16*)(&gBattleBufferA[gActiveBattler][2]);
     BufferStringBattle(*stringId);
-    BattlePutTextOnWindow(gDisplayedStringBattle, 0);
+    BattlePutTextOnWindow(gDisplayedStringBattle, B_WIN_MSG);
     gBattlerControllerFuncs[gActiveBattler] = CompleteOnInactiveTextPrinter;
     BattleTv_SetDataBasedOnString(*stringId);
 }