From 6b26245e506e9c7140f1acad204a5490ef9dff26 Mon Sep 17 00:00:00 2001
From: Luke Campagnola <luke.campagnola@gmail.com>
Date: Fri, 28 Sep 2018 16:02:14 -0700
Subject: [PATCH] Add explanatory comment

---
 pyqtgraph/graphicsItems/AxisItem.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pyqtgraph/graphicsItems/AxisItem.py b/pyqtgraph/graphicsItems/AxisItem.py
index 9ba3c614..a50c75a1 100644
--- a/pyqtgraph/graphicsItems/AxisItem.py
+++ b/pyqtgraph/graphicsItems/AxisItem.py
@@ -1069,6 +1069,10 @@ class AxisItem(GraphicsWidget):
             ret = self.linkedView().mouseDragEvent(event, axis=1)
         else:
             ret = self.linkedView().mouseDragEvent(event, axis=0)
+        # Ignore event because if grid lines are enabled, we don't want the
+        # AxisItem to eat events meant for the ViewBox (see PR #565). A better
+        # solution here is to have grid lines drawn by a separate item inside the 
+        # viewbox.
         event.ignore()
         return ret