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Jason Grout 77ba557156 Backport #1958: Add an output callback override stack ... Fix a subtle async bug in processing comm messages. Basically, message processing did not wait for any promises a comm message handler may return to resolve, because comms were not set up to resolve return values of message handlers. This allows us to override output callbacks to redirect output messages, and is used to implement the Output widget, for example. It does not redirect status messages or messages on other channels. Write the get_output_callback_id function that we use. Return after error condition. Some tests for output callback overrides.		9 years ago
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kernels	Backport #1958: Add an output callback override stack	9 years ago
sessions	use tornado xsrf token in API	9 years ago
config.js	Fix ConfigWithDefaults "this" context	10 years ago
contents.js	avoid double-encoding base_url	10 years ago