bug#71835: 30.0.60; Using mode-line-format-right-align in header line results in cutoff text

[noa]

> Yes, that's how this feature was implemented (and documented).

I checked the documentation before submitting and didn't see anything in the 
documentation to suggest that using this feature would work differently in the 
mode line and header line.  The documentation for header-line-format describes 
it as "analogous to mode-line-format", while the info manual at (elisp) Header 
Lines says it "works just like the mode line feature".  Perhaps a warning in 
one of these places that the right-align doesn't work reliably here would be 
helpful.
-- 
~noa (https://noa.pub)
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