PpPpdOptionWidget and PpIppOptionWidget both use combo boxes for
certain types of selections. With GTK4, combo boxes no longer
support scrolling[0], which in turn causes problems setting some
things in the PpOptionsDialog[1].
This replaces instances of GtkComboBox with GtkDropDown which do
support scrolling. This change was applied to both PpIppOptionWidget
and PpPpdOptionWidget as both are used in PpOptions dialog.
Since the configuration values passed to CUPS can no longer be stored
in a GtkTreeModel alongside the displayed values, some logic changes
to update_widget_real in PpPpdOptionWidget to maintain the reference
to the ppd_option_t so the selected index can be mapped to the
configuration value.
[0] - https://gitlab.gnome.org/GNOME/gtk/-/issues/3674
[1] - https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/1704
Fortunately for us GtkTreeView still operates pretty
much exactly like in GTK3. Other than that, it's a
dense junction of all that we've done so far to port
other panels.
Set 'PageSize' instead of 'media' for new printers since we use PPD
for construction of the combo for selecting of default paper size.
Previously, we've been setting 'media' attribute for new printers.
Attribute 'media' is used by IPP but we set paper size using 'PageSize'
which comes from PPD in the options dialog. Sometimes (quite often) IPP
gets priority over PPD in print systems. Therefore there was inconsistency
of what user set as default paper size on the options dialog and what was used.
Also don't mark IPP and user's local options as default in PpPPDOptionWidget
since it should use just PPD (we can change PPD values only in this widget).
Since we use PPD for setting of paper size in the options dialog, we shouldn't
show a value which user does not change actually (IPP's 'media' vs. PPD's
'PageSize').
https://bugzilla.gnome.org/show_bug.cgi?id=748569
Set 'ppd_filename_set' and 'destination_set' always to FALSE
before requesting the destination and updated PPD file so we can
distinguish when we have all information needed for update
of the PpPPDOptionWidget.
https://bugzilla.redhat.com/show_bug.cgi?id=1211580
Use GCancellable when setting a new value of an option.
This prevents Printers panel from crash caused by
calling of option widget's callback on finalized widget.
https://bugzilla.gnome.org/show_bug.cgi?id=694874
Add Options dialog which allows users to set more options than current dialog.
The dialog reads printer's PPD file and add its options to the dialog together
with some preselected IPP options (#678637).
All operations in the dialog are asynchronous.
During implementation of this, the option for setting allowed users was removed
because this is not suitable for this panel (the option is intended for
administrators).
