[Bug] Overlay created using chart.createOverlay() has empty string for id

[char101]

Version

main

Steps to Reproduce

In this code

KLineChart/src/component/Overlay.ts

Lines 351 to 357 in 0459735

	override (overlay: Partial<OverlayCreate>): void {
	this._prevOverlay = clone(this._overlay)
	const id = this._overlay.id
	merge(this._overlay, overlay)
	if (isString(id)) {
	this._overlay.id = id
	}

this._overlay.id is '', thus isString(id) is true, causing '' to replace back the correct id.

Thus the correct code should be

    if (isString(id) && id !== '') {
      this._overlay.id = id
    }