From 4d6d73eab3d59d9d88f7d18593e357fe6acd96fa Mon Sep 17 00:00:00 2001
From: Artur Wieczorek <artwik@wp.pl>
Date: Sun, 18 Sep 2016 23:07:59 +0200
Subject: [PATCH] Fix wxGraphicsMatrix concatenation (Cairo)

The parameter matrix in wxGraphicsMatrixData::Concat() should be a multiplicand, not a multiplier.

Closes #17670.
---
 src/generic/graphicc.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/generic/graphicc.cpp b/src/generic/graphicc.cpp
index 8c7acc3525..0369cbb452 100644
--- a/src/generic/graphicc.cpp
+++ b/src/generic/graphicc.cpp
@@ -1266,7 +1266,8 @@ wxGraphicsObjectRefData *wxCairoMatrixData::Clone() const
 // concatenates the matrix
 void wxCairoMatrixData::Concat( const wxGraphicsMatrixData *t )
 {
-    cairo_matrix_multiply( &m_matrix, &m_matrix, (cairo_matrix_t*) t->GetNativeMatrix());
+    // The parameter matrix (t) is the multiplicand.
+    cairo_matrix_multiply(&m_matrix, (cairo_matrix_t*) t->GetNativeMatrix(), &m_matrix);
 }
 
 // sets the matrix to the respective values