# HG changeset patch
# User Chris Cannam
# Date 1415613249 0
# Node ID 241688360929f5b947dcf027e7da242353b58b2b
# Parent  d854c72dcaa1f2b4ad2098e0e0ee18e605fed6c4
Discard wildly excessive wheel events

diff -r d854c72dcaa1 -r 241688360929 view/Pane.cpp
--- a/view/Pane.cpp	Fri Oct 03 15:27:02 2014 +0100
+++ b/view/Pane.cpp	Mon Nov 10 09:54:09 2014 +0000
@@ -2286,6 +2286,13 @@
         // Coarse wheel information (or vertical zoom, which is
         // necessarily coarse itself)
 
+        // Sometimes on Linux we're seeing absurdly extreme angles on
+        // the first wheel event -- discard those entirely
+        if (abs(m_pendingWheelAngle) > 1000) {
+            m_pendingWheelAngle = 0;
+            return;
+        }
+        
         while (abs(m_pendingWheelAngle) >= 120) {
 
             int sign = (m_pendingWheelAngle < 0 ? -1 : 1);