Pushing to github (forked repo) topics seem not to work

[Uwe Brauer]

Hi Purpose, I fork a github repository, want to add one change set, on a new branch, and then open a pull request. I could do this with either bookmarks or the new hg-git-mode = branches feature.

However for one changeset creating a named branch seems to much, so I thought of using topics.

It did not work out as expected.

Steps:

1. I fork the github repo https://github.com/melpa/melpa (but just their main branch, the master branch).
2. I just clone this repository but with

[hggit]
usephases = yes
[git]
defaultbranch = master
use_namespaces = True 
[experimental]
enforce-topic = True
hg-git-mode = branches

If I use hg-git-mode = branches, then hg-git imports all commits to the default branch, so if I push then it creates a new branch default, which will confuse.

Now I add a new change set, with the topic matlab

[hggit]
usephases = yes
[git]
defaultbranch = master
use_namespaces = True 
[experimental]
enforce-topic = True
hg-git-mode = topic
graph-group-branches = True
graph-group-branches.firstbranch = .

hg branches shows me

hg branches
master//matlab             13613:79838b8ddafd
master                     13612:b87ade8fbcdd (inactive)
matlab-recipe              10600:4e1e0662a036 (inactive)

And github refuses this push

hg push
pushing to git+ssh://g...@github.com:ouboub/melpa-matlab.git
Warning: Permanently added 'github.com' (ED25519) to the list of known hosts.
searching for changes
 recipes/matlab-mode |  4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
adding objects
remote: found 0 deltas to reuse
remote: refusing to create funny ref 'refs/heads/master//matlab' remotely
remote:
remote: Create a pull request for 'matlab-recipe' on GitHub by visiting:
remote:      https://github.com/ouboub/melpa-matlab/pull/new/matlab-recipe
remote:
added 1 commits with 2 trees and 1 blobs
warning: failed to update refs/heads/master//matlab; funny refname
adding reference refs/heads/matlab-recipe
Warning: Permanently added 'github.com' (ED25519) to the list of known hosts.

Conclusion, for this use case, topics do not work (but it is anyhow experimental)

Any comments?

Uwe Brauer