On the InformationTab a signal is emitted when programatically
setting the index of the dive mode combobox which in turn then
edits the dive.
Usually not a problem, because the editing code realizes that
the value is not changed. It is however a problem when multiple
dives are selected.
Therefore, block the signals when setting the index. Same for
the other comboboxes on the same page.
Fixes#3960.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
35ff6eea35