Multi-selection for TreeView and FileDialog?
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feature request
visualization
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Description
### Discussed in https://github.com/intel-isl/Open3D/discussions/3715
Originally posted by **hduonggithub** July 8, 2021
I would like to check if the TreeView has multi-selection or not? The same question for FileDialog. It will be good if we can select multiple files too.
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