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
fTextFields.put(textControl, key);
		if (isNumber) {
			fNumberFields.add(textControl);
			textControl.addModifyListener(fNumberFieldListener);
		} else {
			textControl.addModifyListener(fTextFieldListener);
		}
			
		return composite;
	}
	
	private void addTextFontEditor(Composite parent, String label, String key) {
		
		Composite editorComposite= new Composite(parent, SWT.NONE);
		GridLayout layout= new GridLayout();
		layout.numColumns= 3;
		editorComposite.setLayout(layout);		
		fFontEditor= new WorkbenchChainedTextFontFieldEditor(key, label, editorComposite);
		fFontEditor.setChangeButtonText(JavaUIMessages.getString("JavaEditorPreferencePage.change")); 
				
		GridData gd= new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		gd.horizontalSpan= 2;
		editorComposite.setLayoutData(gd);
	}
	
	private String loadPreviewContentFromFile(String filename) {
		String line;
		String separator= System.getProperty("line.separator"); 
		StringBuffer buffer= new StringBuffer(512);
		BufferedReader reader= null;