Bug 123496 [IDE] Use operation validation API for IDE actions
We should use the Resources/Core operation validation API in the IDE actions for manipulating resources.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/actions/CopyFilesAndFoldersOperation.java
reportFileInfoNotFound(fileNames[i]);
				return null;
			}
			stores[i] = store;
		}
		return stores;
	}
	/**
	 * Report that a file info could not be found.
	 * 
	 * @param fileName
	 */
	private void reportFileInfoNotFound(final String fileName) {
		messageShell.getDisplay().syncExec(new Runnable() {
			public void run() {
				ErrorDialog
						.openError(
								messageShell,
								getProblemsTitle(),
								NLS
										.bind(
												IDEWorkbenchMessages.CopyFilesAndFoldersOperation_infoNotFound,
												fileName), null);
			}
		});
	}
	/**
	 * Copies the given files and folders to the destination.
	 * 
	 * @param stores