CppTools: Provide hints about chosen project part for editor document

Parse issues can have multiple reasons (invalid kit, not a project file,
actual parse issue) and we should be able to tell them apart. With this
change, we can distinguish between the fallback project part and a
ambiguous project part.

Follow up changes will use this to display more accurate diagnostics.

Change-Id: Icc8767607cc17dc14d6227b07f34e81ba5525a96
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cpptools/builtineditordocumentprocessor.cpp

@@ -190,6 +190,8 @@ BuiltinEditorDocumentProcessor::BuiltinEditorDocumentProcessor(
             });
     }
 
+    connect(m_parser.data(), &BuiltinEditorDocumentParser::projectPartInfoUpdated,
+            this, &BaseEditorDocumentProcessor::projectPartInfoUpdated);
     connect(m_parser.data(), &BuiltinEditorDocumentParser::finished,
             this, &BuiltinEditorDocumentProcessor::onParserFinished);
     connect(&m_semanticInfoUpdater, &SemanticInfoUpdater::updated,