Dap: fix several issues with the Disconnect operation (bgo#724656)
DapInfoBar was not being destroyed on the main thread, which could lead to crashes (I've seen some platforms more prone to crash with this than others). Fixing this exposed other synchronization issues, such as not checking for null in the same thread as the one doing the operation on a widget, and looping over a collection which could be modified, in which case we need to make a copy of it before iterating.
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1d38b818
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