Bug 65031 [Preferences] Local History preference page doesn't use dialog font
RC1 see attached screen shot
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/FileStatesPage.java
/**
	 * Recomputes the page's error state by validating all
	 * the fields.
	 */
	private void checkState() {
		
		if (longevityText == null
			|| maxStatesText == null
			|| maxStateSizeText == null) {
			setValid(false);
			return;
		}
		if (validateLongTextEntry(longevityText) == FAILED_VALUE) {
			setValid(false);
			return;
		}
		if (validateMaxFileStates() == FAILED_VALUE) {
			setValid(false);
			return;
		}
		if (validateMaxFileStateSize() == FAILED_VALUE) {
			setValid(false);
			return;
		}
		setValid(true);
		setErrorMessage(null);
	}
	/* 
	* Create the contents control for the workspace file states.
	* @returns Control