Remove dispose call for Colors in AntPreviewerUpdater

According to the Javadoc on Colors:

 * Colors do not need to be disposed, however to maintain compatibility
 * with older code, disposing a Color is not an error.

Author: vogella

ant/org.eclipse.ant.ui/Ant Tools Support/org/eclipse/ant/internal/ui/preferences/AntPreviewerUpdater.java

@@ -122,43 +122,27 @@ protected void initializeViewerColors(ISourceViewer viewer, IPreferenceStore sto
 				: createColor(store, AbstractTextEditor.PREFERENCE_COLOR_FOREGROUND, styledText.getDisplay());
 		styledText.setForeground(color);
 
-		if (fForegroundColor != null) {
-			fForegroundColor.dispose();
-		}
-
 		fForegroundColor = color;
 
 		// ---------- background color ----------------------
 		color = store.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT) ? null
 				: createColor(store, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND, styledText.getDisplay());
 		styledText.setBackground(color);
 
-		if (fBackgroundColor != null) {
-			fBackgroundColor.dispose();
-		}
-
 		fBackgroundColor = color;
 
 		// ----------- selection foreground color --------------------
 		color = store.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_SELECTION_FOREGROUND_SYSTEM_DEFAULT) ? null
 				: createColor(store, AbstractTextEditor.PREFERENCE_COLOR_SELECTION_FOREGROUND, styledText.getDisplay());
 		styledText.setSelectionForeground(color);
 
-		if (fSelectionForegroundColor != null) {
-			fSelectionForegroundColor.dispose();
-		}
-
 		fSelectionForegroundColor = color;
 
 		// ---------- selection background color ----------------------
 		color = store.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_SELECTION_BACKGROUND_SYSTEM_DEFAULT) ? null
 				: createColor(store, AbstractTextEditor.PREFERENCE_COLOR_SELECTION_BACKGROUND, styledText.getDisplay());
 		styledText.setSelectionBackground(color);
 
-		if (fSelectionBackgroundColor != null) {
-			fSelectionBackgroundColor.dispose();
-		}
-
 		fSelectionBackgroundColor = color;
 	}
 
@@ -192,25 +176,4 @@ private Color createColor(IPreferenceStore store, String key, Display display) {
 		return null;
 	}
 
-	public void dispose() {
-		if (fForegroundColor != null) {
-			fForegroundColor.dispose();
-			fForegroundColor = null;
-		}
-
-		if (fBackgroundColor != null) {
-			fBackgroundColor.dispose();
-			fBackgroundColor = null;
-		}
-
-		if (fSelectionForegroundColor != null) {
-			fSelectionForegroundColor.dispose();
-			fSelectionForegroundColor = null;
-		}
-
-		if (fSelectionBackgroundColor != null) {
-			fSelectionBackgroundColor.dispose();
-			fSelectionBackgroundColor = null;
-		}
-	}
 }