Bug 17295 Formating pref page: remove the icons in the tabs
The icons add minimal value and we should remove them.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CodeFormatterPreferencePage.java
String number= textControl.getText();
		IStatus status= validatePositiveNumber(number);
		if (!status.matches(IStatus.ERROR)) {
			fWorkingValues.put(key, number);
		}
		if (PREF_TAB_SIZE.equals(key)) {
			fSourceViewer.getTextWidget().setTabs(getPositiveIntValue(number, 0));
		}			
		updateStatus(status);
		updatePreview();
	}
		
	
	/*
	 * @see IPreferencePage#performOk()
	 */
	public boolean performOk() {
		String[] allKeys= getAllKeys();
		
		
		Hashtable actualOptions= JavaCore.getOptions();
		for (int i= 0; i < allKeys.length; i++) {
			String key= allKeys[i];
			String val=  (String) fWorkingValues.get(key);
			actualOptions.put(key, val);
		}
		JavaCore.setOptions(actualOptions);
		JavaPlugin.getDefault().savePluginPreferences();
		return super.performOk();
	}