Show warning before exiting Dawn if there are unsaved changes

pioneers / dawn-v0

(archived; now in PiECentral) Dawn is a cross-platform frontend for the Pioneers in Engineering robotics control system.

https://pioneers.berkeley.edu

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Show warning before exiting Dawn if there are unsaved changes #231

Closed AllanYangZhou closed 8 years ago

AllanYangZhou commented 8 years ago

Currently if students have unsaved changes to their code, and they close Dawn, no warning is presented and their changes are lost. We should display a warning in these cases.