ClangCodeModel: Ignore redundant semantic tokens

This can now happen due to the newly implemented refresh support.

Change-Id: If64feede84b044140f7ec04e317289d3f493aa53
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/languageclient/semantichighlightsupport.h

@@ -50,6 +50,11 @@ public:
     QString type;
     QStringList modifiers;
 };
+inline bool operator==(const ExpandedSemanticToken &t1, const ExpandedSemanticToken &t2)
+{
+    return t1.line == t2.line && t1.column == t2.column && t1.length == t2.length
+            && t1.type == t2.type && t1.modifiers == t2.modifiers;
+}
 using SemanticTokensHandler = std::function<void(TextEditor::TextDocument *,
                                                  const QList<ExpandedSemanticToken> &, int)>;