Disable swap-branches-on-compare on blank page

[kidonng]

Fix #6513

Test URLs

https://github.com/refined-github/refined-github/compare

Screenshot

Screen.Recording.2023-04-15.at.21.31.36.mov

[fregante]

By the way the position of the button is too far here 😬 it should always be next to the right-hand selector, like in your other screenshots

[kidonng]

By the way the position of the button is too far here 😬 it should always be next to the right-hand selector, like in your other screenshots

Thought the same thing, well it's an oversight since I didn't tested it in the restore PR

EDIT: fixed! Also updated screencast

[fregante]

[fregante]

I think this broke some views. See:

• missing: main...8dc69ec (isBlank)
• present: 8dc69ec...main (has commits)

I think the condition is not isBlank but "is identical". This can be checked in the URL, probably:

const [a,b] = path.split('...');
a === b

Note that these two URLs show the same comparison:

• https://github.com/refined-github/refined-github/compare/8dc69ecc
• main...8dc69ec