Group completion requests and only handle the last one
Summary: I noticed that we sometimes wait quite long on code completion requests, especially when editing header files. The edit operation in a header invalidates the preamble, so reparsing will always take quite some time. Nothing we can do about that, really. But at least we can make sure we don't do work for naught: The old code just emitted signals whenever code completion is invoked. This can happen multiple times while we are editing the header. Since the computation takes time, the subsequent completion requests pile up and will all be handled eventually. If you are then impatient and go to a different file, we will still go through all requests even though they are not interesting anymore. This patch groups the completion requests together with a simple timer to ensure we only handle the last request once the current completion job has finished. Subscribers: kdevelop-devel Differential Revision: https://phabricator.kde.org/D12298
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