currentZoomMatrix

Returns the current zoom matrix, accounting for RESIZE_MODE_ZOOM which already has an implicit zoom applied.

This is different from zoomMatrix ?: Matrix() because it allows used to start zooming at different resizeModes.

The main issue is that RESIZE_MODE_FIT = 100% zoom, but if you are in RESIZE_MODE_ZOOM 100% will make the zoom snap to less zoomed in then you already are.