X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FSeqPanel.java;h=126d755212f545bbc975941771e0c01f40094ef8;hb=129fc8c4f960f978baef88779939592e7b4227d2;hp=9d2e84c76a90e82d3f091361936f9b11cd41531f;hpb=6a5e618f368b1e0d828629228fd5c238ddef484d;p=jalview.git

diff --git a/src/jalview/gui/SeqPanel.java b/src/jalview/gui/SeqPanel.java
index 9d2e84c..126d755 100755
--- a/src/jalview/gui/SeqPanel.java
+++ b/src/jalview/gui/SeqPanel.java
@@ -607,7 +607,7 @@ public class SeqPanel extends JPanel implements MouseListener,
         {
           int fontSize = av.font.getSize();
 
-          if (evt.getY() < lastMousePress.getY() && av.charHeight > 1)
+          if (evt.getY() < lastMousePress.getY())
           {
             fontSize--;
           }
@@ -616,10 +616,12 @@ public class SeqPanel extends JPanel implements MouseListener,
             fontSize++;
           }
 
+          if(fontSize<1)
+            fontSize = 1;
+
           av.setFont(new Font(av.font.getName(), av.font.getStyle(), fontSize));
           av.charWidth = oldWidth;
           ap.fontChanged();
-
         }
         else
         {
@@ -635,6 +637,9 @@ public class SeqPanel extends JPanel implements MouseListener,
           ap.repaint();
         }
 
+        FontMetrics fm = getFontMetrics(av.getFont());
+        av.validCharWidth = fm.charWidth('M') <= av.charWidth;
+
         lastMousePress = evt.getPoint();
 
         return;