# HG changeset patch
# User Chris Cannam
# Date 1415613260 0
# Node ID 0cdaf382f21eb4c743f71c7fad3fe9573aeefbe7
# Parent  6c08e99ca0f3019133f88c82c4df6d7468e85e69
Discard wildly excessive wheel events

diff -r 6c08e99ca0f3 -r 0cdaf382f21e view/Pane.cpp
--- a/view/Pane.cpp	Mon Nov 10 09:20:06 2014 +0000
+++ b/view/Pane.cpp	Mon Nov 10 09:54:20 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);