Warn us we'll lose our local work when going back to Dashboard!

[pipedreambomb]

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I got into a git issue which I'll describe below. I thought I'd go back to dashboard and then open my repository again. All my local git branches are gone!! Hence all my local work had gone. Which I hadn't pushed anywhere because git wasn't working.

The git issue arose because I'd deleted the branch from GitHub after completing a pull request. I had forgotten to switch to a new branch in StackBlitz, so after doing my work I tried to commit and push. It not only didn't work, but after that, any attempt to use git via the VS options just led to error messages. It was at this point that I tried the above solution and lost all my work.

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Warn people, when the click the back to dashboard button, that it will lose all their local git branches.

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