src/vs/workbench/contrib/comments/browser/commentsEditorContribution.ts/CommentController/onEditorMouseMove
class CommentController:	private onEditorMouseMove(e: IEditorMouseEvent): void {
		const position = e.target.position?.lineNumber;
		if (e.event.leftButton.valueOf() && position && this.mouseDownInfo) {
			this._commentingRangeDecorator.updateSelection(position, new Range(this.mouseDownInfo.lineNumber, 1, position, 1));
		} else {
			this._commentingRangeDecorator.updateHover(position);
		}
	}