Adds trackable tab helper

Author: eamodio

src/system/-webview/vscode/tabs.ts

@@ -1,6 +1,7 @@
 import type { Tab } from 'vscode';
 import { Uri, window } from 'vscode';
 import { areUrisEqual } from '../../uri';
+import { isTrackableUri } from './uris';
 
 export function getTabUri(tab: Tab | undefined): Uri | undefined {
 	const input = tab?.input;
@@ -44,6 +45,11 @@ export function getVisibleTabs(uri: Uri): Tab[] {
 		.sort((a, b) => (a.group.isActive ? -1 : 1) - (b.group.isActive ? -1 : 1));
 }
 
+export function isTrackableTab(tab: Tab | undefined): boolean {
+	const uri = getTabUri(tab);
+	return uri != null ? isTrackableUri(uri) : false;
+}
+
 export function tabContainsUri(tab: Tab | undefined, uri: Uri | undefined): boolean {
 	if (uri == null) return false;
 

src/system/-webview/vscode/uris.ts

@@ -20,9 +20,11 @@ export async function openUrl(url?: string): Promise<boolean | undefined> {
 	// vscode.d.ts currently says it only supports a Uri, but it actually accepts a string too
 	return (env.openExternal as unknown as (target: string) => Thenable<boolean>)(url);
 }
+
 export function isTrackableUri(uri: Uri): boolean {
 	return trackableSchemes.has(uri.scheme as Schemes);
 }
+
 export function isVirtualUri(uri: Uri): boolean {
 	return uri.scheme === Schemes.Virtual || uri.scheme === Schemes.GitHub;
 }

src/views/nodes/lineHistoryTrackerNode.ts

@@ -139,10 +139,10 @@ export class LineHistoryTrackerNode extends SubscribeableViewNode<
 		setLogScopeExit(scope, `, uri=${Logger.toLoggable(this._uri)}`);
 		return { cancel: !updated };
 	}
+
 	@debug()
 	protected async subscribe(): Promise<Disposable | undefined> {
 		await this.updateUri();
-
 		if (this.view.container.lineTracker.subscribed(this)) return undefined;
 
 		const onActiveLinesChanged = debounce(this.onActiveLinesChanged.bind(this), 250);
@@ -172,6 +172,7 @@ export class LineHistoryTrackerNode extends SubscribeableViewNode<
 	private onActiveLinesChanged(_e: LinesChangeEvent) {
 		void this.triggerChange();
 	}
+
 	@gate()
 	@log()
 	async changeBase(): Promise<void> {