From a130a59111353c5277abcb37605845ae7d5b143e Mon Sep 17 00:00:00 2001
From: Jay Nabonne <jay.nabonne@geoteric.com>
Date: Mon, 21 Jan 2019 12:35:55 +0000
Subject: [PATCH] Handle clipping regions with negative width or height in wxQt

---
 src/qt/dc.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/qt/dc.cpp b/src/qt/dc.cpp
index 2d91673124..35dec4b0ac 100644
--- a/src/qt/dc.cpp
+++ b/src/qt/dc.cpp
@@ -416,6 +416,17 @@ void wxQtDCImpl::DoSetClippingRegion(wxCoord x, wxCoord y,
     }
     else
     {
+        if ( width < 0 )
+        {
+            width = -width;
+            x -= width - 1;
+        }
+        if ( height < 0 )
+        {
+            height = -height;
+            y -= height - 1;
+        }
+
         if (m_qtPainter->isActive())
         {
             // Set QPainter clipping (intersection if not the first one)