From 55d21a436f538c5f2c445398904024189298f071 Mon Sep 17 00:00:00 2001
From: Luke Campagnola <luke.campagnola@gmail.com>
Date: Thu, 27 Jul 2017 22:21:02 -0700
Subject: [PATCH] ViewBox: mark matrix dirty _before_ emitting change signal to
 ensure that slots can access the latest transform.

---
 pyqtgraph/graphicsItems/ViewBox/ViewBox.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyqtgraph/graphicsItems/ViewBox/ViewBox.py b/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
index 9af43614..8ade0c6b 100644
--- a/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
+++ b/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
@@ -1482,9 +1482,9 @@ class ViewBox(GraphicsWidget):
             self.sigYRangeChanged.emit(self, tuple(self.state['viewRange'][1]))
         
         if any(changed):
+            self._matrixNeedsUpdate = True
             self.sigRangeChanged.emit(self, self.state['viewRange'])
             self.update()
-            self._matrixNeedsUpdate = True
         
             # Inform linked views that the range has changed
             for ax in [0, 1]: