Here is hopefully a better solution for GTK 3 in bullseye:
https://people.debian.org/~smcv/bullseye-gtk-printing/mr6.1/
or if the release team will not accept that, then this:
https://people.debian.org/~smcv/bullseye-gtk-printing/mr9.1/
Please try those (in preference to mr6, mr9) and see what happens with
your particular printers.
As before, the _binary.changes and .dsc files are signed with my key in
the Debian keyring, and can be verified with the dscverify tool from the
devscripts package (this requires devscripts and debian-archive-keyring
installed).
Test results below.
smcv
> * Which versions of cups-daemon and cups-filters-core-drivers are installed?
cups-daemon 2.3.3op2-3+deb11u1
cups-filters-core-drivers 1.28.7-1
> * How many printers are physically present on your network?
One HP Color LaserJet MFP M277dw.
> * Is cups-browsed installed? If yes, which version?
I tested both with and without cups-browsed 1.28.7-1.
Test methodology for each of the 8 attempts listed here (I'm using an
expendable test machine, do not do these steps unless you are willing
to lose manual CUPS configuration):
sudo apt purge cups-browsed cups-daemon
sudo rm -fr /etc/cups
sudo apt install cups cups-core-drivers cups-daemon cups-browsed-
(optionally) Configure printer: gnome-control-center, Printers, Unlock,
Add..., wait, click on the single printer that appears, Add
(optionally) sudo apt install cups-browsed
gedit
Try to print
GTK 3.24.24-4 (status quo in bullseye)
======================================
Repeating my previous test results for reference:
| cups-browsed installed |
| no | yes |
--------------------------------|------------|-----------|
printer manually configured no|unavailable | works |
yes| works |duplicated |
--------------------------------|------------|-----------|
GTK based on merge request 6 (full backport from 3.24.29)
=========================================================
| cups-browsed installed |
| no | yes |
--------------------------------|------------|-----------|
printer manually configured no| works | works |
yes| works | works |
--------------------------------|------------|-----------|
With no configuration and no cups-browsed: One printer appears in the
GTK dialog, labelled HP_Color_LaserJet_MFP_M277dw_xxxxxx_. It is not
listed in /etc/cups/printers.conf. Printing is successful.
With cups-browsed only: One printer appears, labelled
HP_Color_LaserJet_MFP_M277dw_xxxxxx_.
It is listed in /etc/cups/printers.conf, labelled as having come from
cups-browsed. It prints successfully.
With manual configuration only: One printer, HP-Color-LaserJet-MFP-M277dw.
It appears in /etc/cups/printers.conf. Printing is successful.
(This is actually better than the Qt app featherpad, which displays two
printers in this situation.)
With both: Same as with manual configuration only.
GTK based on merge request 9 (Daniel's minimal backport)
========================================================
| cups-browsed installed |
| no | yes |
--------------------------------|------------|--------------------|
printer manually configured no| works | works |
yes| works | duplicated |
--------------------------------|------------|--------------------|
With no configuration and no cups-browsed: One printer appears in the
GTK dialog, labelled HP_Color_LaserJet_MFP_M277dw_xxxxxx_. It is not
listed in /etc/cups/printers.conf. Printing is successful.
With cups-browsed only: One printer, HP_Color_LaserJet_MFP_M277dw_xxxxxx_,
where xxxxxx is a unique ID taken from its MAC address. It is in
/etc/cups/printers.conf. Printing is successful.
With manual configuration only: One printer, HP-Color-LaserJet-MFP-M277dw.
It appears in /etc/cups/printers.conf. Printing is successful.
With both: both of the printers mentioned above appear in the GTK dialog
and in /etc/cups/printers.conf. Only the first one printed successfully:
the second logged "NO_DEST_FOUND".
