X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fappletgui%2FIdCanvas.java;h=5313b413969ca7815e62e5d3e70d3953f52b5e84;hb=a41b74d63832baaf00daac0a176118dc751c3b24;hp=74bbcf53407445f158baac342f96c2ee4917e8ee;hpb=c1f777a6a4a74ee1573e5f3f883e0de902818ae7;p=jalview.git

diff --git a/src/jalview/appletgui/IdCanvas.java b/src/jalview/appletgui/IdCanvas.java
index 74bbcf5..5313b41 100755
--- a/src/jalview/appletgui/IdCanvas.java
+++ b/src/jalview/appletgui/IdCanvas.java
@@ -402,8 +402,12 @@ public class IdCanvas extends Panel implements ViewportListenerI
   public void propertyChange(PropertyChangeEvent evt)
   {
     // Respond to viewport range changes (e.g. alignment panel was scrolled)
-    if (evt.getPropertyName().equals("startseq")
-            || evt.getPropertyName().equals("endseq"))
+    // Both scrolling and resizing change viewport ranges: scrolling changes
+    // both start and end points, but resize only changes end values.
+    // Here we only want to fastpaint on a scroll, with resize using a normal
+    // paint, so scroll events are identified as changes to the horizontal or
+    // vertical start value.
+    if (evt.getPropertyName().equals(ViewportRanges.STARTSEQ))
     {
       fastPaint((int) evt.getNewValue() - (int) evt.getOldValue());
     }