In 3.36, we will use a heavily blurred wallpaper on the lock screen.
As that wallpaper will be unrecognizable, there is no good reason to
pick a different one from the regular session. The shell will therefore
stop using the separate lock-screen settings.
The popover isn't needed anymore because it would only have one option:
to set the wallpaper. And an additional option for the recent section to
remove the wallpaper for the list, which can be done via a overlay
button.
https://gitlab.gnome.org/GNOME/gnome-control-center/issues/864
Undefine the value before overriding it to avoid the following warnings:
../panels/background/cc-background-chooser.c:22: warning: "G_LOG_DOMAIN" redefined
Add a recent section, composed by an additional GtkFlowBox and
a separator, and code to hide it when there are no recent
wallpapers.
To the popover menu, add a new "Remove Background" button that
is only visible when clicking on recent backgrounds.
This is a major rework on how images are loaded and stored.
Unfortunately, this is so entangled that doing each change
as an atomic step is pretty much unfeasible.
The first major change is that BgSource now returns a GListStore
instead of a GtkListStore. This is necessary for us to bind it
to GtkFlowBox, and pretty much signals we're not using any of
the tree/icon views anymore.
Second, the thumbnail factory was moved to BgSource itself. We
only create factories for large thumbnails, so it's not needed
to handle each one of them individually.
At last, switch CcBackgroundChooser to GtkFlowBox, and adjust
the signals we connect to.
It will become essentially what CcBackgroundChooserDialog,
but without a dialog and organized differently. Right now,
it is as minimal as it could be and only shows wallpapers.
As we grow it, it may cover pictures and even colors.
