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Bug
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    Resolution: Done
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P2: Important
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    Qt Creator 4.10.0-beta2
 
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        3fbb5ddba873e65855e8cf4d9b404170746fc511 (qt-creator/qt-creator/4.10)
 
When I open the first document in a project, no textDocument/documentSymbol request is sent to my language server, and no Outline is available.
If I just close the document and open it again (by double clicking at the file under "Other files" in the Projects field), Qt Creator do send a textDocument/documentSymbol request and successfully populates its Outline field with the information from my language server.
Se the log for details.