Clang: Auto reparse if diagnostic config changes

On diagnostic config change, affected documents are closed behind the
scenes. Visible ones are parsed immediately, invisible ones are tagged
for parse once they become visible.

Task-number: QTCREATORBUG-16263
Change-Id: Id4dcc69f1a4bfccc597e798d6821f8718f86e352
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cpptools/baseeditordocumentprocessor.h

@@ -93,6 +93,8 @@ public:
     virtual QFuture<SymbolInfo> requestFollowSymbol(int line, int column) = 0;
     virtual QFuture<ToolTipInfo> toolTipInfo(const QByteArray &codecName, int line, int column);
 
+    QString filePath() const { return m_filePath; }
+
 public:
     using HeaderErrorDiagnosticWidgetCreator = std::function<QWidget*()>;
 
@@ -117,7 +119,6 @@ protected:
                           BaseEditorDocumentParser::UpdateParams updateParams);
 
     // Convenience
-    QString filePath() const { return m_filePath; }
     unsigned revision() const { return static_cast<unsigned>(m_textDocument->revision()); }
     QTextDocument *textDocument() const { return m_textDocument; }