src/vs/workbench/contrib/terminal/browser/terminalGroupService.ts/TerminalGroupService/moveGroupToEnd
class TerminalGroupService:	moveGroupToEnd(source: ITerminalInstance): void {
		const sourceGroup = this.getGroupForInstance(source);
		if (!sourceGroup) {
			return;
		}
		const sourceGroupIndex = this.groups.indexOf(sourceGroup);
		this.groups.splice(sourceGroupIndex, 1);
		this.groups.push(sourceGroup);
		this._onDidChangeInstances.fire();
	}