Don't assume history requests succeed in qtconsole #745
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If there was an error in user startup code, the history request will be aborted. It is generally not acceptable in frontends to assume that requests succeed. This assumption is made all over our frontend code, and should be be fixed. For now, this handles a known issue of the qtconsole crashing hard when invalid input is given to startup code (e.g.
ipython qtconsole -c "DNE"
).If the history request was aborted (this means a different request raised an error, causing the queue to be flushed), it will be tried again, exactly once, after waiting for the abort flush.