[WIP/RFC] Follow chains of fixits #4263
                
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Sometimes resolving a fixit (eventually) results in more than one fixit. In those cases, ycmd will send the first one and set
keep_goingtoTrue.We can't reuse request data, because we need to inform ycmd about the updated state of the buffers.
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Why this change is necessary and useful
This is the client counterpart to ycm-core/ycmd#1760
This change is