src/vs/workbench/contrib/extensions/browser/extensionEditor.ts/ExtensionEditor/openTab
class ExtensionEditor:	async openTab(tab: ExtensionEditorTab): Promise<void> {
		if (!this.input || !this.template) {
			return;
		}
		if (this.template.navbar.switch(tab)) {
			return;
		}
		// Fallback to Readme tab if ExtensionPack tab does not exist
		if (tab === ExtensionEditorTab.ExtensionPack) {
			this.template.navbar.switch(ExtensionEditorTab.Readme);
		}
	}