[PATCH] Restore selection after renumbering dives (fixes #917)

[Sander M. Kleijwegt]

Dear All,

please find attached a patch for #917:

After renumbering any number of selected dives, the selected
dives would still be selected, but this was not visible from
the divelist view. Clicking on subsequent dives would deselect
them while the GUI shows them as selected, any further action
like delete would not be done on the visible selection, but
on the invisible dive->selected state, leading to apparently
very weird behaviour.

kind regards,
Sander Kleijwegt
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