I have wanted to tweak the interface to Synaptic for a long time. After recent personal success with the MATE Themes package, I feel ready to try to tackle that.
However, looking around, I see that the Home Site for Synaptic is resident on what I would normally consider the "palliative care ward", before disappearing into "bitstream heaven"! That usually suggests to me that the creators have walked away from the package.
However, looking at Launchpad, we see the following:
That is more than I can see on the Debian site itself where, while it offers this info, I don't seem to be able to find source code there ... and it also points to the non-gnu site. So it seems that the support for Synaptic is gradually disappearing. In my mind, that would be a crying shame, given what it can do.
So ... if I wanted to make changes/enhancements to the Synaptic GUI (options for presenting window sizes for both package download and the installation log terminal),
To mark an answer as being the one that solved a topic, just click on the green check mark icon of that answer, which is the leftmost icon of the icon group that appears at the the bottom of every answer (the second icon in that same row of icons is the heart / like icon which only appears for answers not written by you, as apparently you can't like your own answers here, although the green check mark also appears in your own answers, as users are allowed to mark their own answer as being the one that solved a topic).
Thank you for a very comprehensive (as usual!) answer, @ricmarques !
I can only add that this forum runs on discourse software.
If you plan to contribute your changes back to the source code, use the latest sources from Github. If you are just experimenting for yourself, it is easier to get and build the sources from the repository. Check this tutorial: