From 9be1251f020a6708112189e7e2c8b0ccec1b8608 Mon Sep 17 00:00:00 2001
From: Artur Wieczorek <artwik@wp.pl>
Date: Fri, 8 Jul 2016 19:51:02 +0200
Subject: [PATCH] Modified methods used to set/unset wxPGProperty as read-only
 and to hide/show it.

If there is requested to set/unset a single property (without recursion) as a read-only (wxPropertyGridInterface::SetPropertyReadOnly) or to hide/show it (wxPropertyGridInterface::HideProperty) then first check if property is already in the requested state and if so do nothing. This prevents from unneeded refreshing of the display.
---
 src/propgrid/propgridiface.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/propgrid/propgridiface.cpp b/src/propgrid/propgridiface.cpp
index 85e8f95c2a..52c10de16c 100644
--- a/src/propgrid/propgridiface.cpp
+++ b/src/propgrid/propgridiface.cpp
@@ -279,9 +279,17 @@ void wxPropertyGridInterface::SetPropertyReadOnly( wxPGPropArg id, bool set, int
     wxPG_PROP_ARG_CALL_PROLOG()
 
     if ( flags & wxPG_RECURSE )
+    {
         p->SetFlagRecursively(wxPG_PROP_READONLY, set);
+    }
     else
+    {
+        // Do nothing if flag is already set.
+        if ( p->HasFlag(wxPG_PROP_READONLY) )
+            return;
+
         p->ChangeFlag(wxPG_PROP_READONLY, set);
+    }
 
     wxPropertyGridPageState* state = p->GetParentState();
     if( state )
@@ -557,6 +565,15 @@ bool wxPropertyGridInterface::HideProperty( wxPGPropArg id, bool hide, int flags
 {
     wxPG_PROP_ARG_CALL_PROLOG_RETVAL(false)
 
+    // Do nothing if single property is already hidden/visible as requested.
+    if ( !(flags & wxPG_RECURSE) )
+    {
+        if ( hide && p->HasFlag(wxPG_PROP_HIDDEN) )
+            return false;
+        if ( !hide && !p->HasFlag(wxPG_PROP_HIDDEN) )
+            return false;
+    }
+
     wxPropertyGrid* pg = m_pState->GetGrid();
 
     if ( pg == p->GetGrid() )