Color nodes that are 'going to be collapsed' for e.g. 500ms

[cmdcolin]

request from @ihh

[ihh]

To be 100% accurate my request is also that the rows & columns of the alignment that are about to disappear should be colored as well as the parts of the tree that are on the way out.

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[cmdcolin]

this could be somewhat fixed by #91

it highlights all rows when mouseover on a parent tree node