From edba1b5b28cadbe1f85f811cc104c74212a2e675 Mon Sep 17 00:00:00 2001
From: Paul Licameli <paul.licameli@audacityteam.org>
Date: Wed, 22 Jan 2020 13:18:24 -0500
Subject: [PATCH] Avoid unnecessary update before drawing ruler grid...

... which matters for some displays such as in Equalization, though not for
track vertical rulers
---
 src/widgets/Ruler.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/widgets/Ruler.cpp b/src/widgets/Ruler.cpp
index 6874f3979..db9146184 100644
--- a/src/widgets/Ruler.cpp
+++ b/src/widgets/Ruler.cpp
@@ -1403,7 +1403,8 @@ void Ruler::DrawGrid(wxDC& dc, int length, bool minor, bool major, int xOffset,
    mMajorGrid = major;
    mMinorGrid = minor;
 
-   Update( dc, nullptr );
+   if ( !mValid )
+      Update( dc, nullptr );
 
    int gridPos;
    wxPen gridPen;