How to add a display property when a char appear in a buffer.

[Feng Shu]

Hi:

I want to auto add display property :min-width '(2.0), when a char
*appear* into a buffer. this char maybe inserted by user command, maybe
inserted in elisp.

any good way? I have try to use post-command, but seem to be not a good
idea for low performance.

thanks.


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