Pull request selection with unrelated branches

[invertium]

Description

In my repository I have 3 branches. One Master branch and two other branches (which don't share a a common history with the master but not each other, lets call them A and B). Now I want to open a PR from branch A to branch B. Unfortunately, since master is the default branch, as soon as I select "pull from" as branch A I get the error message "cannot merge unrelated branches". This is all well and good but now the selection box is gone, and I cannot select branch B (which should work since they have a common history).

Screenshots

Workaround: Type the branche names into the url directly.

[stale]

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