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Header assignment to CompImageHDU is not preserved on write #14081
Description
Consider:
>>> from astropy.io import fits
>>> ih = fits.ImageHDU()
>>> ih.header['test'] = 'right'
>>> ch = fits.CompImageHDU()
>>> ch.header['test'] = 'wrong'
>>> ch.header = ih.header # Assign the CompImageHDU the header from the ImageHDU
>>> ch.header['test']
'right' # This makes sense and is what I want
>>> ch.writeto('tmp.fits')
>>> chdl = fits.open('tmp.fits')
>>> chdl[1].header['test']
'wrong' # This doesn't seem right
I'm trying to assign a Header object to the .header attribute of a CompImageHDU. This assignment works while the HDU is in memory, but as soon as it's written to disk it reverts to the old header.
I looked into it a little bit and it looks like maybe CompImageHDU needs a custom setter on its .header attribute?? That's just a guess though.
Thanks!
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