Prevent Admin Bar Items From Wrapping if There's More Items Than the Available Adminbar Width #352
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Trac ticket: https://core.trac.wordpress.org/ticket/44438 (has been open for some time without being really followed up on so hopefully this PR breathes some life back into this.)
The Trac ticket has a bunch of additional details regarding the issue being resolved here, screenshots, etc.
Code here is from version 1.0.3 of https://wordpress.org/plugins/admin-bar-wrap-fix/ (June 22, 2020) per that plugin ideally not being necessary to prevent issues that this resolves (with WordPress just preventing it from the start.) Somewhat of a "patch plugin" equivalent to a "feature plugin" WordPress has for forthcoming features, and it might be good to include it in the WP core at some point (if not now).
Edit: Also see https://core.trac.wordpress.org/ticket/28983 as this ticket may take precedent as it's older than my ticket mentioned above while discussing the same issue (though the actual method/implementation to proceed with is yet to be decided, it seems.)