Usability enhancement: click & drag to select multiple lines in the code blob viewer

Created by: bradtchapman

Feature request description

I'd like to be able to click & drag to select multiple lines in the code blob viewer

Is your feature request related to a problem? If so, please describe.

No problem, just a usability enhancement. I discovered this by accident while creating an issue in another developer's repository.

Describe alternatives you've considered.

The only workaround is to click the first line, hold Shift, and click the last line.

Additional context

The screenshot shows the part of the GitHub UI that I'm referring to.

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