X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FSeqPanel.java;fp=src%2Fjalview%2Fgui%2FSeqPanel.java;h=fdb75a45da75fa023787a8f4da47aabc5e4971f5;hb=775dfa570270fb0f0a82948546a816996d999719;hp=9b3ae3e7539127c12fc707d3c6714fe5f734fd3e;hpb=5f01d4060ac01ebac24998f906e1e52959d568ec;p=jalview.git

diff --git a/src/jalview/gui/SeqPanel.java b/src/jalview/gui/SeqPanel.java
index 9b3ae3e..fdb75a4 100644
--- a/src/jalview/gui/SeqPanel.java
+++ b/src/jalview/gui/SeqPanel.java
@@ -1141,7 +1141,8 @@ public class SeqPanel extends JPanel
 
     String tooltip = AnnotationPanel.buildToolTip(anns[rowIndex], column,
             anns);
-    if (!tooltip.equals(lastTooltip))
+    boolean tooltipChanged = tooltip == null ? lastTooltip != null : !tooltip.equals(lastTooltip);
+    if (tooltipChanged)
     {
       lastTooltip = tooltip;
       lastFormattedTooltip = tooltip == null ? null