Open the conflict resolver for uploading nodes. Given the current content of the directory and the conflicting new nodes, this will ask the user for resolving the conflicts and return the conflict resolution.
The directory name with conflicts (used for the dialog title)
The incoming nodes
The current content of the directory (existing nodes)
Optional
options: ConflictPickerOptionsOptional settings for the conflict picker
The conflict resolution or null if the user aborted.
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