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.cpp

@@ -167,6 +167,12 @@ void ClangEditorDocumentProcessor::recalculateSemanticInfoDetached(bool force)
     m_builtinProcessor.recalculateSemanticInfoDetached(force);
 }
 
+void ClangEditorDocumentProcessor::semanticRehighlight()
+{
+    m_semanticHighlighter.updateFormatMapFromFontSettings();
+    m_semanticHighlighter.run();
+}
+
 CppTools::SemanticInfo ClangEditorDocumentProcessor::recalculateSemanticInfo()
 {
     return m_builtinProcessor.recalculateSemanticInfo();