JAL-147 extract local variable for ease of debugging

diff --git a/src/jalview/viewmodel/ViewportRanges.java b/src/jalview/viewmodel/ViewportRanges.java
index 36e598f..abbc24c 100644 (file)
--- a/src/jalview/viewmodel/ViewportRanges.java
+++ b/src/jalview/viewmodel/ViewportRanges.java
@@ -227,9 +227,10 @@ public class ViewportRanges extends ViewportProperties
   public void setStartEndSeq(int start, int end)
   {
     int oldstartseq = this.startSeq;
-    if (start > getVisibleAlignmentHeight() - 1)
+    int visibleHeight = getVisibleAlignmentHeight();
+    if (start > visibleHeight - 1)
     {
-      startSeq = Math.max(getVisibleAlignmentHeight() - 1, 0);
+      startSeq = Math.max(visibleHeight - 1, 0);
     }
     else if (start < 0)
     {
@@ -241,9 +242,9 @@ public class ViewportRanges extends ViewportProperties
     }
 
     int oldendseq = this.endSeq;
-    if (end >= getVisibleAlignmentHeight())
+    if (end >= visibleHeight)
     {
-      endSeq = Math.max(getVisibleAlignmentHeight() - 1, 0);
+      endSeq = Math.max(visibleHeight - 1, 0);
     }
     else if (end < 0)
     {