I have some stuff in my mousepadrc since I created the file to set the font sizes for printing. I can't figure out how to set the default paper to A4. It would be useful to have a wiki with a list of all the possible configuration options somewhere online to refer to. Wasn't sure how to raise this as an issue so I've added it as a bug here although it probably isn't quite the right place.
What version of Mousepad are you using? I don't have a printer here, but Mousepad just uses standard Gtk+ printing so it may be that there is some non-app-specific info out on the web about configuring that (or maybe it's left entirely to the application?).
Apparently you can set the `LC_PAPER` environment variable to the locale with your desired paper default, for example if I run: $ LC_PAPER="en_GB.UTF-8" mousepad Then the print dialog defaults to A4 instead of my native locale's Letter default. Presumably you can set this variable in `~/.profile` for your user or `/etc/environment` for all users.
Adding the following lines to mousepadrc seems to work: [Print Settings] page-setup-saved=true paper-format=iso_a4 https://developer.gnome.org/gtk3/stable/GtkPaperSize.html#GtkPaperSize-struct
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