src/vs/workbench/contrib/terminal/browser/terminalGroupService.ts/TerminalGroupService/_removeGroup
class TerminalGroupService:	private _removeGroup(group: ITerminalGroup) {
		// Get the index of the group and remove it from the list
		const activeGroup = this.activeGroup;
		const wasActiveGroup = group === activeGroup;
		const index = this.groups.indexOf(group);
		if (index !== -1) {
			this.groups.splice(index, 1);
			this._onDidChangeGroups.fire();
		}

		// Adjust focus if the group was active
		if (wasActiveGroup && this.groups.length > 0) {
			const newIndex = index < this.groups.length ? index : this.groups.length - 1;
			this.setActiveGroupByIndex(newIndex, true);
			this.activeInstance?.focus(true);
		} else if (this.activeGroupIndex >= this.groups.length) {
			const newIndex = this.groups.length - 1;
			this.setActiveGroupByIndex(newIndex);
		}

		this._onDidChangeInstances.fire();
		if (this.groups.length === 0) {
			this._onDidChangeActiveInstance.fire(undefined);
		}

		this._onDidChangeGroups.fire();
		if (wasActiveGroup) {
			this._onDidChangeActiveGroup.fire(this.activeGroup);
		}
	}