LAB: Wait for the end of sound effects when they are played in Diff f…

…iles. Fixes toilet noises.

engines/lab/processroom.cpp

@@ -252,9 +252,16 @@ void LabEngine::doActions(const ActionList &actionList) {
 			_music->loadSoundEffect(action->_messages[0], true, false);
 			break;
 
-		case kActionShowDiff:
+		case kActionShowDiff: {
+			bool curWait = _anim->_waitForEffect;
+			// Pause the engine until the sound is finished
+			_anim->_waitForEffect = true;
 			_graphics->readPict(action->_messages[0], true);
+
+			// Restore the previous value of _waitForEffect
+			_anim->_waitForEffect = curWait;
 			break;
+			}
 
 		case kActionShowDiffLooping:	// used in scene 44 (heart of the labyrinth, minotaur)
 			_graphics->readPict(action->_messages[0], false);