From 5e66fb7d2e3cccf7e83fb4424e67f73ce48b0bfe Mon Sep 17 00:00:00 2001
From: ali kettab <aliket1435@gmail.com>
Date: Tue, 12 May 2026 01:40:54 +0100
Subject: [PATCH] wxMSW: Fix drawing vertical lines with pen width > 1 in RTL
 layout

Shift them to account for an offset when using RTL.

Closes #26448.
---
 src/msw/dc.cpp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index 19f2c6487b..486ba71a71 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -718,7 +718,18 @@ void wxMSWDCImpl::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
     }
     else
     {
-        wxDrawLine(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2));
+        int dx = 0;
+
+        // In RTL layout, we need this adjustment because vertical lines drawn
+        // with pen width > 1 are incorrectly shifted to the left by one pixel.
+        if ( x1 == x2 && y1 != y2 &&
+             m_pen.GetWidth() > 1 &&
+             GetLayoutDirection() == wxLayout_RightToLeft )
+        {
+            dx = -1;
+        }
+
+        wxDrawLine(GetHdc(), XLOG2DEV(x1) + dx, YLOG2DEV(y1), XLOG2DEV(x2) + dx, YLOG2DEV(y2));
     }
 
     if ( AreAutomaticBoundingBoxUpdatesEnabled() )