PolylineDecorator.getBounds() throws error

I’ve run into an issue when trying to find the bounds of a PolylineDecorator.

Since PolylineDecorator is a FeatureGroup, it has getBounds method. That method will try to iterate all of its layers and call getBounds or getLatLng on those. But because the child layers are instances of LayerGroup, they do not have either method, and so a TypeError: e.getLatLng is not a function error is thrown.

Since the 1.3.0 release the bounds of the child layers would not even be the real bounds of a PolylineDecorator - the closest we could get now is the bound of its paths.

These changes work for my use-case, I could make a PR of them, if it would get merged:

L.PolylineDecorator = L.FeatureGroup.extend({
    /* ... */

    setPaths: function(paths) {
        /* ... */
        this._bounds = this._initBounds();
    },

    initialize: function(paths, options) {
        /* ... */
        this._bounds = this._initBounds();
    },

    _initBounds: function () {
        var bounds = L.latLngBounds(this._paths[0]);
        for (var i = 1; i < this._paths.length; ++i) {
            bounds.extends(L.latLngBounds(this._paths[i]))
        }
        return bounds;
    },

    getBounds: function () {
      return this._bounds;
    }
});

[bbecquet]

I had some time so I added it myself. It should be fixed in version 1.6.0. Thanks for your help!

[transducer]

Same issue with getLatLng?