Meta list: #18467
It appears that there is not an implementation for nav items that responds to $enable-flex: true;. This may not be in-scope, but wanted to mention it.
NOTE that it is not based on compiled css with $enable-flex: true; as that doesn't exist in dist. Nonetheless, I see the same behavior in a flex enabled scenario. Here's a screenshot of the same thing rendered with $enable-flex: true;:

Bootlint failed on a sample copied from the v4 navbar docs :)
I updated the test case with an inner container.
Ignore Bootlint in this case: https://github.com/twbs/bootstrap/issues/18790#issuecomment-169620411
Not sure if this is still an issue, but I think if you make the container class have flex-direction: row, it solves the issue.
https://gist.github.com/alwaysbrightblue/a66fed1fb9f7210fe803
This may be a good flex setup:
.navbar {
display: flex;
flex-direction: row;
flex-wrap: nowrap;
flex-shrink: 0;
align-items: center;
align-self: stretch;
> * {
flex-shrink: 0;
}
}
The problem I see with integrating this is the doc/examples with identical markup. I'll take a shot at a navbar flexbox PR and see if I can get something working both ways.
PR #18976 flexbox enables the navbar
Is this issue solved because of #18976? @rosskevin
@jorge-sanz it is for me. I'm using directly in bootstrap-material-design v4 (we are standardizing on flex-only)
Ok! Cool! I am a newbie contributor and I would like to start to code for Bootstrap! @rosskevin
Most helpful comment
This may be a good flex setup:
The problem I see with integrating this is the doc/examples with identical markup. I'll take a shot at a navbar flexbox PR and see if I can get something working both ways.