Highlight yanked text for Vim9.
# Default values
g:hlyanked_hlgroup = 'Visual'
g:hlyanked_timeout = 400 # [ms]
When you yank some new text, the newly yanked text ends up in the 1 register and the content of the following registers is shifted by one (i.e. the content of register 2 is moved into register 3, the content of register 3 is moved into register 4 and so on). In this way you never lose previously yanked text.
To disable such a behavior set:
g:hlyanked_save_yanks = false
BSD-3 Clause.