Merge pull request #173 from vue-leaflet/fix-170

  [#231 Possible Regression](https://github.com/vue-leaflet/vue-leaflet/issues/231).

- Reworked attribution update handler to resolve

  [#165 Error when updating attribution prop for tileLayer](https://github.com/vue-leaflet/vue-leaflet/issues/165).

- Default Leaflet icon is replaced by an empty div initially when a Marker has content in its slot that has not

  yet rendered, resolving

  [#170 Blinking default marker when using custom icon component](https://github.com/vue-leaflet/vue-leaflet/issues/170).

## [0.8.1] - 2023-01-29

      (newIcon) => leafletRef.value.setIcon && leafletRef.value.setIcon(newIcon)

    );

    const { options, methods } = setupMarker(props, leafletRef, context);

    if (options.icon === undefined) {

      // If the options object has a property named 'icon', then Leaflet will overwrite

      // the default icon with it for the marker, _even if it is undefined_.

      // This leads to the issue discussed in https://github.com/vue-leaflet/vue-leaflet/issues/130

      delete options.icon;

    }

    const eventHandlers = {

      moveHandler: debounce(methods.latLngSync),

    };

    onMounted(async () => {

      const { marker, DomEvent } = useGlobalLeaflet

      const { marker, DomEvent, divIcon } = useGlobalLeaflet

        ? WINDOW_OR_GLOBAL.L

        : await import("leaflet/dist/leaflet-src.esm");

      // If an icon is not specified in the options but there is content in the LMarker's slot, then

      // set the initial icon to an empty div that will be invisible until it's replaced by any calls

      // to `setIcon` or `setParentHtml` from within the default slot. This avoids the icon flickering

      // discussed in https://github.com/vue-leaflet/vue-leaflet/issues/170.

      if (!options.icon && context.slots.default) {

        options.icon = divIcon({ className: "" });

      }

      leafletRef.value = marker(props.latLng, options);

      const listeners = remapEvents(context.attrs);

      DomEvent.on(leafletRef.value, listeners);

      leafletRef.value.on("move");

      leafletRef.value.on("move", eventHandlers.moveHandler);

      propsBinder(methods, leafletRef.value, props);

      addLayer({

        ...props,