Fixes #734: added a warning about unsaved changes

[patyiscoding]

closes #734

[BenGamma]

Nice one with the message ! I'll fix the conflicts myself and will merge. Thanks 🙌

[patyiscoding]

@BenGamma I think there's a problem though, as it was based on the solution I wanted to merge for #757 from 307dd32 😂 The Prompt here depends on the upload status of how-tos and it has to be reset somewhere. That's also why the upload status panel in #757 was showing up.

[patyiscoding]

ok, I added the reset next to the changes from your 6a0da09 solution, should work now 👌

[cypress]

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Test summary

28 • 2 • 10 • 0

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Run details

Project	onearmy-community-platform
Status	Failed
Commit	869dec8
Started	Nov 11, 2019 10:23 AM
Ended	Nov 11, 2019 10:33 AM
Duration	10:06 💡
OS	Linux Ubuntu Linux - 14.04
Browser	Electron 73

View run in Cypress Dashboard ➡️

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Failures

	cypress/integration/events.spec.ts ⏯		2
1	[Events] > [List events] > [By Everyone]
2	[Events] > [Filter Events] > [By Everyone]

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[drydenwilliams]

Cool component, didn't know about this 👍

[BenGamma]

Thanks ! Nice and easy.
In an ideal world we would display the Prompt only if the form values have changed, but that's less urgent. The important thing is that the values that the user entered in his how-to doesn't disapear in case of wrong manipulation.
I created a separate issue for that later #766