[FEATURE] zoom to extent of overrideGeojsonSource when using initialView in config

[G-Boyce]

Is there an existing issue for this?

• I have searched the existing issues

Who request this Feature

DMP tool (Data Management Plan)

User Story

When "initialView" is set in the "viewSettings" of the map config,
and the "overrideGeojsonSource" method is used to replace a GeoJSON data layer,
then:

• Zoom to the extent of the new data layer
• Change the "Home" button to zoom to that extent.

Implementation UI

When creating a map manually with "createMapFromConfig", and then using "overrideGeojsonSource", this zoom does NOT happen automatically, and the Home button ("Reset to initial view") ISN'T changed to new extent.

However, when the map is created using cgpv.init, and then using "overrideGeojsonSource", this DOES automatically zoom to the new extent, and the Home button IS changed. (@DamonU2 is surprised that this happens here at all, so it might be accidental).

For an example of this good behaviour using cgpv.init, see this DMP web page

If you'd like copies of the underlying code, please ask. Thanks