JAL-147 don't page up above origin, repaint ids for scroll in wrapped

[jalview.git] / src / jalview / viewmodel / ViewportRanges.java

diff --git a/src/jalview/viewmodel/ViewportRanges.java b/src/jalview/viewmodel/ViewportRanges.java
index 162e712..f290ae7 100644 (file)
--- a/src/jalview/viewmodel/ViewportRanges.java
+++ b/src/jalview/viewmodel/ViewportRanges.java
@@ -535,7 +535,7 @@ public class ViewportRanges extends ViewportProperties
   {
     if (wrappedMode)
     {
-      setStartRes(getStartRes() - getViewportWidth());
+      setStartRes(Math.max(0, getStartRes() - getViewportWidth()));
     }
     else
     {