Bug#955759: Oversized debian logo in GDM

[Simon McVittie]

On Sat, 04 Apr 2020 at 19:40:46 +0200, Laurent Bigonville wrote:
> After upgrading from 3.36.0 to 3.36.1, the debian logo in GDM is way to
> big.

I'd noticed that. Looks like this is sort-of-deliberate, because Ubuntu
want to match up their logo in the Plymouth boot splash with the one
in gdm:

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1101

"""
loginDialog: Retain native logo dimensions

So that the same logo may be used during boot and keeps its dimensions
on the login screen, appearing to never move.

Related to: https://bugs.launchpad.net/bugs/1867133
"""

The old behaviour was to scale it to be 48px tall, preserving aspect
ratio.

We can use logo-text-version-64.png or logo-text-64.png instead of
the current -128 (halving the size), or we can ask the desktop-base
maintainers to give us a 48px tall version if we want the same size as
in buster.

For now I'll make it use the -64 version, which looks fine on my 1440px
screen (on which GNOME defaults to 200% scaling, so the logo sizing is
as though my screen was only 720px).

    smcv