Glow ctx fix to avoid recursive call of nav_zoom

xtt/lib/glow/src/glow_ctx.cpp

@@ -833,14 +833,14 @@ void GlowCtx::paste_execute()
 
 void GlowCtx::nav_zoom()
 {
+  if (nodraw)
+    return;
+
   if (ctx_type == glow_eCtxType_Curve) {
     ((CurveCtx*)this)->nav_zoom();
     return;
   }
 
-  if (nodraw)
-    return;
-
   if (a.size() > 0) {
     get_borders();
     double x_nav_left = MIN(x_left, mw.offset_x / mw.zoom_factor_x);