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= new Label(stylesComposite, SWT.LEFT);
		label.setText(JavaUIMessages.getString("JavaEditorPreferencePage.color")); 
		gd= new GridData();
		gd.horizontalAlignment= GridData.BEGINNING;
		label.setLayoutData(gd);
		fSyntaxForegroundColorEditor= new ColorEditor(stylesComposite);
		Button foregroundColorButton= fSyntaxForegroundColorEditor.getButton();
		gd= new GridData(GridData.FILL_HORIZONTAL);
		gd.horizontalAlignment= GridData.BEGINNING;
		foregroundColorButton.setLayoutData(gd);
		label= new Label(stylesComposite, SWT.LEFT);
		label.setText(JavaUIMessages.getString("JavaEditorPreferencePage.bold")); 
		gd= new GridData();
		gd.horizontalAlignment= GridData.BEGINNING;
		label.setLayoutData(gd);
		
		fBoldCheckBox= new Button(stylesComposite, SWT.CHECK);
		gd= new GridData(GridData.FILL_HORIZONTAL);
		gd.horizontalAlignment= GridData.BEGINNING;
		fBoldCheckBox.setLayoutData(gd);
		
		label= new Label(colorComposite, SWT.LEFT);
		label.setText(JavaUIMessages.getString("JavaEditorPreferencePage.preview")); 
		label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		
		Control previewer= createPreviewer(colorComposite);
		gd= new GridData(GridData.FILL_BOTH);
		gd.widthHint= convertWidthInCharsToPixels(80);
		gd.heightHint= convertHeightInCharsToPixels(15);