From c627898ec1f06b4dae1620299739e0f40eafe6a6 Mon Sep 17 00:00:00 2001
From: volconst <20997907+volconst@users.noreply.github.com>
Date: Sat, 19 Sep 2020 18:32:41 +0300
Subject: [PATCH] Fix duplicate wheel event delivery #1110

 In Debian, Ubuntu.
---
 printrun/gcview.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/printrun/gcview.py b/printrun/gcview.py
index e07d712f1..3565c8eab 100755
--- a/printrun/gcview.py
+++ b/printrun/gcview.py
@@ -227,7 +227,14 @@ def layerdown(self):
         self.parent.setlayercb(new_layer)
         wx.CallAfter(self.Refresh)
 
+    wheelTimestamp = None
     def handle_wheel(self, event):
+        if self.wheelTimestamp == event.Timestamp:
+            # filter duplicate event delivery in Ubuntu, Debian issue #1110
+            return  
+
+        self.wheelTimestamp = event.Timestamp
+
         delta = event.GetWheelRotation()
         factor = 1.05
         if event.ControlDown():