Disable save buttons when slave is offline

With the instance status unknown now meaning assigned slave is offline
the save list buttons can now easily be disabled using this status.
Disable the upload save, download save and delete save buttons when the
slave is offline or the instance is not assigned to a slave.

packages/web_ui/src/components/SavesList.jsx

@@ -29,6 +29,7 @@ export default function SavesList(props) {
 	let [starting, setStarting] = useState(false);
 	let [uploadingFiles, setUploadingFiles] = useState([]);
 
+	let slaveOffline = ["unassigned", "unknown"].includes(props.instance.status);
 	const saveTable = <Table
 		size="small"
 		columns={[
@@ -79,6 +80,7 @@ export default function SavesList(props) {
 					}}
 				>Load save</Button>
 				<Button
+					disabled={slaveOffline}
 					onClick={() => {
 						libLink.messages.downloadSave.send(
 							control, { instance_id: props.instance.id, save: save.name }
@@ -102,7 +104,7 @@ export default function SavesList(props) {
 						).catch(notifyErrorHandler("Error deleting save"));
 					}}
 				>
-					<Button danger>Delete</Button>
+					<Button danger disabled={slaveOffline}>Delete</Button>
 				</Popconfirm>
 			</Space>,
 		}}
@@ -141,6 +143,7 @@ export default function SavesList(props) {
 	}
 
 	let uploadProps = {
+		disabled: slaveOffline,
 		name: "file",
 		accept: ".zip",
 		headers: {
@@ -157,7 +160,7 @@ export default function SavesList(props) {
 	return <div>
 		<SectionHeader title="Saves" extra=<Space>
 			<Upload {...uploadProps} >
-				<Button>Upload save</Button>
+				<Button disabled={slaveOffline}>Upload save</Button>
 			</Upload>
 			<CreateSaveModal instance={props.instance} />
 		</Space> />