(svn r11287) -Codechange: add support for pushing paramaters into NewIndustries' error messages. Patch by Csaboka.

src/newgrf_industrytiles.cpp

@@ -265,6 +265,11 @@ bool PerformIndustryTileSlopeCheck(TileIndex ind_base_tile, TileIndex ind_tile,
 		return callback_res != 0;
 	}
 
+	/* Copy some parameters from the registers to the error message text ref. stack */
+	SwitchToErrorRefStack();
+	PrepareTextRefStackUsage(4);
+	SwitchToNormalRefStack();
+
 	switch (callback_res) {
 		case 0x400: return true;
 		case 0x401: _error_message = STR_0239_SITE_UNSUITABLE;                 return false;