(svn r7621) -Codechange: Rework ShowQuery into a general modal popup window. It gets passed

a parent pointer which will be blocked as long as the popup is open. This
 applies to newgrf-apply, heightmap warning, genworld progress.

openttd.h

@@ -443,7 +443,7 @@ enum {
 	WC_SIGN_LIST,
 	WC_GENERATE_LANDSCAPE,
 	WC_GENERATE_PROGRESS_WINDOW,
-	WC_OK_CANCEL_QUERY,
+	WC_CONFIRM_POPUP_QUERY,
 	WC_DEPOT_SELL_ALL,
 };