Bug 283457 [CSS][UI] Odd coloring of shutdown dialog
The dialog for confirming workbench closing has odd coloring. It's from this in webby.css: Composite { background-color: rgb(241, 240, 245); } Need to make that expression more specific to the layout of the perspective contents.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/SWTPartRenderer.java
* HACK: Create a wrapper composite with appropriate layout for the purpose
	 * of styling margins. See bug #280632
	 */
	protected Composite createWrapperForStyling(Composite parentWidget) {
		Composite layoutHolder = new Composite(parentWidget, SWT.NONE);
		addLayoutForStyling(layoutHolder);
		layoutHolder.setData("org.eclipse.e4.ui.css.swt.marginWrapper", true); 
		return layoutHolder;
	}
	/*
	 * HACK: Add layout information to the composite for the purpose of styling
	 * margins. See bug #280632
	 */
	protected void addLayoutForStyling(Composite composite) {
		GridLayout gl = new GridLayout(1, true);
		composite.setLayout(gl);
		gl.horizontalSpacing = 0;
		gl.verticalSpacing = 0;
		gl.marginHeight = 0;
		gl.marginWidth = 0;
	}
	/*
	 * HACK: Prep the control with layout information for the purpose of styling
	 * margins. See bug #280632
	 */
	protected void configureForStyling(Control control) {
		control.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	}
}