Bug 16923 Auto activation preference dialog
The auto activation characters and Timeout Text fields are enabled even when Auto activation itself is disabled. This was confusing to me because I thought that "." should cause automatic code assist, but it wasn't. Disabling the feature should disable the controls what modify the details for that feature.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorPreferencePage.java
label= JavaUIMessages.getString("JavaEditorPreferencePage.autoActivationTriggersForJava"); 
		addTextField(contentAssistComposite, label, ContentAssistPreference.AUTOACTIVATION_TRIGGERS_JAVA, 4, 0, false);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.autoActivationTriggersForJavaDoc"); 
		addTextField(contentAssistComposite, label, ContentAssistPreference.AUTOACTIVATION_TRIGGERS_JAVADOC, 4, 0, false);
								
		label= JavaUIMessages.getString("JavaEditorPreferencePage.backgroundForCompletionProposals"); 
		addColorButton(contentAssistComposite, label, ContentAssistPreference.PROPOSALS_BACKGROUND, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.foregroundForCompletionProposals"); 
		addColorButton(contentAssistComposite, label, ContentAssistPreference.PROPOSALS_FOREGROUND, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.backgroundForMethodParameters"); 
		addColorButton(contentAssistComposite, label, ContentAssistPreference.PARAMETERS_BACKGROUND, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.foregroundForMethodParameters"); 
		addColorButton(contentAssistComposite, label, ContentAssistPreference.PARAMETERS_FOREGROUND, 0);
				
		return contentAssistComposite;
	}
	/*
	 * @see PreferencePage#createContents(Composite)
	 */
	protected Control createContents(Composite parent) {
		
		fOverlayStore.load();
		fOverlayStore.start();
		
		TabFolder folder= new TabFolder(parent, SWT.NONE);
		folder.setLayout(new TabFolderLayout());