Editor: Fix crash in the generic highighlighter.
Remove the TextBlockUserData base class BlockData and store the data of this class inside a CodeFormatter base class. This class can be added to the TextBlockUserData via setCodeFormatterData. Now we don't have to assume that the user data is a specific base class of TextBlockUserData. This removes a crash where the TextBlockUserData was created before the highlighter could create and set his base class. Task-number: QTCREATORBUG-10871 Change-Id: I167bdb68b9b1fecc64e4906bdad60bfbecb3bf47 Reviewed-by: Eike Ziller <firstname.lastname@example.org>
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