CppEditor: Fix semantic highlighting when zooming

...for the not visible documents.

First reset the extra additional formats, then set the new ones, not the
other way around.

Task-number: QTCREATORBUG-14579
Change-Id: Iae465bd9a7bb0a397fd4917df45955713aaf87c5
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/clangcodemodel/clangeditordocumentprocessor.h

@@ -56,6 +56,7 @@ public:
 
     // BaseEditorDocumentProcessor interface
     void run() override;
+    void semanticRehighlight() override;
     void recalculateSemanticInfoDetached(bool force) override;
     CppTools::SemanticInfo recalculateSemanticInfo() override;
     CppTools::BaseEditorDocumentParser *parser() override;