Is good practice to no write on a closed bug as the conversation might get lost if it doesn't fully belong to the context of the patch.
The bag is also marked with "See also: bug 1732260", which is a continuation of the work done on this bug to convert the whole attachment view to pure HTML, so the work is not done.
Unless this patch caused a breakage, an issue, or a regression, it's good practice to open a new bug with the
depends flag pointing at this one, to state your enhancement propositions.
Doing so helps keep the bug history clean, and properly notifies all the developers that worked on this bug that a "follow up" was opened, and the conversation can be done in the new bug without polluting a closed one.