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Prepares this document for saving.
DocumentViewer.prototype.prepareToSave = function() prepareToSave(): boolean;
true if the document in the viewe requires saving; otherwise, false.
This method must be called before the LEADDocument currently in the viewer is saved or passed to a document services that uses the LEADTOOLS Document Converters for conversion to a new format.
The method will update all the data that might have been changed by the user including the text or annotations containers.
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