src/vs/workbench/api/common/extHostOutput.ts/ExtHostOutputChannel/replace
class ExtHostOutputChannel:	replace(value: string): void {
		const till = this.offset;
		this.info(value);
		this.proxy.$update(this.id, OutputChannelUpdateMode.Replace, till);
		if (this.visible) {
			this.logger.flush();
		}
	}