From e9e14063f246a84e5bcbee68794126a6e51140d4 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 24 May 2020 22:26:56 +0200
Subject: [PATCH] Account for the extra border around the thumb in wxMSW
 wxSlider

Without the extra margin, part of the thumb was truncated when
wxSL_TICKS was not used, but wxSL_BOTH (which makes the thumb bigger
than without it) was.
---
 src/msw/slider.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/msw/slider.cpp b/src/msw/slider.cpp
index 49e4bb07cb..d859ea5d55 100644
--- a/src/msw/slider.cpp
+++ b/src/msw/slider.cpp
@@ -548,7 +548,11 @@ wxSize wxSlider::DoGetBestSize() const
 {
     // this value is arbitrary:
     const int length = FromDIP(100);
-    const int thumbSize = GetThumbLength();
+
+    // We need 2 extra pixels (which are not scaled by the DPI by the native
+    // control) on either side to account for the focus rectangle.
+    const int thumbSize = GetThumbLength() + 4;
+
     const int tickSize = FromDIP(TICK);
 
     int *width;