Swipe mode fix ups round 2

[jumpinjackie]

Some new issues discovered with the recently introduced swipe mode:

1. In split mode, changing the style of any layer on the secondary map is not reflected on the secondary map. See attached screenshot were I was able to change the layer style of the layer on the primary map, but doing this to the layer on the secondary map (by changing color to purple-pink) does not apply. It still looks bright green.

However, if after this I map switch to secondary and the back to primary and re-activate swipe mode, the secondary map will have the correct style that I applied, so there must be some "update OL layer's internal style with the latest settings from its layer style model" code path that not being it if I were applying layer style changes on the secondary map in swipe mode.

2. Also in swipe mode, if I select on the secondary map, I lose the ability to select on the primary map. Hovering still happens on the primary map. Deactivating swipe mode does not fix this.