Make nullFrame only once

diff --git a/src/jalview/appletgui/AlignViewport.java b/src/jalview/appletgui/AlignViewport.java
index 36b0a31..481a657 100755 (executable)
--- a/src/jalview/appletgui/AlignViewport.java
+++ b/src/jalview/appletgui/AlignViewport.java
@@ -63,6 +63,7 @@ public class AlignViewport
   int wrappedWidth;\r
 \r
   Font font = new Font("SansSerif", Font.PLAIN, 10);\r
+  boolean validCharWidth = true;\r
   AlignmentI alignment;\r
 \r
   ColumnSelection colSel = new ColumnSelection();\r
@@ -422,12 +423,17 @@ public class AlignViewport
     return endSeq;\r
   }\r
 \r
+  java.awt.Frame nullFrame;\r
   public void setFont(Font f)\r
   {\r
     font = f;\r
-    java.awt.Frame temp = new java.awt.Frame();\r
-    temp.addNotify();\r
-    java.awt.FontMetrics fm = temp.getGraphics().getFontMetrics(font);\r
+    if(nullFrame == null)\r
+    {\r
+      nullFrame = new java.awt.Frame();\r
+      nullFrame.addNotify();\r
+    }\r
+\r
+    java.awt.FontMetrics fm = nullFrame.getGraphics().getFontMetrics(font);\r
     setCharHeight(fm.getHeight());\r
     setCharWidth(fm.charWidth('M'));\r
   }\r