Fix #23023: Fix logic for enabling buttons in color preferences (patch by Larsossum)

This makes the buttons work properly with the filterfield.

git-svn-id: https://josm.openstreetmap.de/svn/trunk@18781 0c6e7542-c601-0410-84e7-c038aed88b3b

Author: taylor.smock

src/org/openstreetmap/josm/gui/preferences/display/ColorPreference.java

@@ -441,10 +441,12 @@ public void tableChanged(TableModelEvent e) {
 
     private void updateEnabledState() {
         int sel = colors.getSelectedRow();
-        if (sel < 0 || sel >= colors.getRowCount()) {
-            return;
+        ColorEntry ce;
+        if (sel >= 0 && sel < colors.getRowCount()) {
+            ce = (ColorEntry) colors.getValueAt(sel, 0);
+        } else {
+            ce = null;
         }
-        ColorEntry ce = (ColorEntry) colors.getValueAt(sel, 0);
         remove.setEnabled(ce != null && isRemoveColor(ce));
         colorEdit.setEnabled(ce != null);
         defaultSet.setEnabled(ce != null && !ce.isDefault());