src/vs/workbench/contrib/output/electron-sandbox/outputChannelModelService.ts/OutputChannelBackedByFile/append
class OutputChannelBackedByFile:	append(message: string): void {
		// update end offset always as message is read
		this.endOffset = this.endOffset + VSBuffer.fromString(message).byteLength;
		if (this.loadingFromFileInProgress) {
			this.appendedMessage += message;
		} else {
			this.write(message);
			if (this.model) {
				this.appendedMessage += message;
				if (!this.modelUpdater.isScheduled()) {
					this.modelUpdater.schedule();
				}
			}
		}
	}