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/cpptools/builtineditordocumentprocessor.cpp

@@ -182,6 +182,14 @@ void BuiltinEditorDocumentProcessor::recalculateSemanticInfoDetached(bool force)
     m_semanticInfoUpdater.updateDetached(source);
 }
 
+void BuiltinEditorDocumentProcessor::semanticRehighlight()
+{
+    if (m_semanticHighlighter && m_semanticInfoUpdater.semanticInfo().doc) {
+        m_semanticHighlighter->updateFormatMapFromFontSettings();
+        m_semanticHighlighter->run();
+    }
+}
+
 SemanticInfo BuiltinEditorDocumentProcessor::recalculateSemanticInfo()
 {
     const auto source = createSemanticInfoSource(false);