Frozon Horizon

Log message got whole process stuck when I use python open3d and cpp lib together

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### Checklist - [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues). - [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip). - [X] I have checked the [release...

#### Describe the bug When I add mesh data to viewer, show_lines can toggle the visbility of face edges, but when I add only points and edges to viewer(to display...