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.showQuickFixables"); 
		addCheckBox(composite, label, JavaEditorPreferencePage.PREF_SHOW_TEMP_PROBLEMS, 0);
		
		return composite;
	}
	private Control createContentAssistPage(Composite parent) {
		Composite contentAssistComposite= new Composite(parent, SWT.NULL);
		GridLayout layout= new GridLayout(); layout.numColumns= 2;
		contentAssistComposite.setLayout(layout);
				
		String label= JavaUIMessages.getString("JavaEditorPreferencePage.insertSingleProposalsAutomatically"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.AUTOINSERT, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.showOnlyProposalsVisibleInTheInvocationContext"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.SHOW_VISIBLE_PROPOSALS, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.presentProposalsInAlphabeticalOrder"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.ORDER_PROPOSALS, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.enableAutoActivation"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.AUTOACTIVATION, 0);
		label= JavaUIMessages.getString("JavaEditorPreferencePage.automaticallyAddImportInsteadOfQualifiedName"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.ADD_IMPORT, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.fillArgumentNamesOnMethodCompletion"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.FILL_METHOD_ARGUMENTS, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.autoActivationDelay"); 
		addTextField(contentAssistComposite, label, ContentAssistPreference.AUTOACTIVATION_DELAY, 4, 0, true);