Enhancement: Support relative file paths for `%attach()%`

[KonstabelKen]

Currently %attach()% requires an absolute file path, and it would be helpful if it supported relative file paths like the %file()% variable.

[RealRaven2000]

Currently %attach()% requires an absolute file path, and it would be helpful if it supported relative file paths like the %file()% variable.

can you try this version below:

smartTemplate-fx-4.17.1pre2.zip

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To try out this version, download the zip file and then drag it into Thunderbird Add-ons Manager (without extracting).