Dispose font in TerminalColorsFieldEditor

TerminalColorsFieldEditor had a dispose method, but
FieldEditorPreferencePage does not call dispose on the
individual field editors despite API implication that
it should.

Change-Id: I98c2987446d8b005cbca571763a9e811e966e0d3

Author: jonahgraham

terminal/plugins/org.eclipse.tm.terminal.control/src/org/eclipse/tm/internal/terminal/preferences/TerminalPreferencePage.java

@@ -37,6 +37,8 @@
  */
 public class TerminalPreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage {
 
+	private TerminalColorsFieldEditor terminalColorsFieldEditor;
+
 	public TerminalPreferencePage() {
 		super(GRID);
 	}
@@ -72,6 +74,16 @@ protected void setupEditors() {
 		addField(new IntegerFieldEditor(ITerminalConstants.PREF_BUFFERLINES, TerminalMessages.BUFFERLINES,
 				getFieldEditorParent()));
 
-		addField(new TerminalColorsFieldEditor(getFieldEditorParent()));
+		terminalColorsFieldEditor = new TerminalColorsFieldEditor(getFieldEditorParent());
+		addField(terminalColorsFieldEditor);
+	}
+
+	@Override
+	public void dispose() {
+		if (terminalColorsFieldEditor != null) {
+			terminalColorsFieldEditor.dispose();
+		}
+
+		super.dispose();
 	}
 }