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.synchronizeOnCursor"); 
		addCheckBox(behaviorComposite, label, JavaEditorPreferencePage.PREF_SYNC_OUTLINE_ON_CURSOR_MOVE, 0);
		label= JavaUIMessages.getString("JavaEditorPreferencePage.showOverviewRuler"); 
		addCheckBox(behaviorComposite, label, CompilationUnitEditor.OVERVIEW_RULER, 0);
				
		label= JavaUIMessages.getString("JavaEditorPreferencePage.showLineNumbers"); 
		addCheckBox(behaviorComposite, label, JavaEditor.LINE_NUMBER_RULER, 0);
		label= JavaUIMessages.getString("JavaEditorPreferencePage.highlightMatchingBrackets"); 
		addCheckBox(behaviorComposite, label, CompilationUnitEditor.MATCHING_BRACKETS, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.highlightCurrentLine"); 
		addCheckBox(behaviorComposite, label, CompilationUnitEditor.CURRENT_LINE, 0);
				
		label= JavaUIMessages.getString("JavaEditorPreferencePage.showPrintMargin"); 
		addCheckBox(behaviorComposite, label, CompilationUnitEditor.PRINT_MARGIN, 0);
		Label l= new Label(behaviorComposite, SWT.LEFT );
		GridData gd= new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		gd.horizontalSpan= 2;
		gd.heightHint= convertHeightInCharsToPixels(1) / 2;
		l.setLayoutData(gd);
		
		l= new Label(behaviorComposite, SWT.LEFT);
		l.setText(JavaUIMessages.getString("JavaEditorPreferencePage.appearanceOptions")); 
		gd= new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		gd.horizontalSpan= 2;
		l.setLayoutData(gd);
		Composite editorComposite= new Composite(behaviorComposite, SWT.NONE);
		layout= new GridLayout();
		layout.numColumns= 2;