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This avoids the dialog being too wide by default.

Make the headerbar not show its "close" back button when the additional
back button is visible.

It's not worth showing poorly sized desktop screenshots on a phone.

This makes it fit phones.

This makes it work on mobile but not on desktops.

This makes it work on mobile but not on desktops.

This helps it work well on mobile but not on desktops.

This makes it work better on phones but less well on desktops.

Shuffle the layout a bit to better work on phones, but less well on
desktops.

This drops the selection button as well as the action bar containing the
selection actions as the action bar is too wide to fit in a phone and
the actions are not supported by Phosh anyway.

This conflicts with the one from the view switcher.

This makes the header work in both desktops and mobiles.

This prevents the window from being stupidly small.

Make it work well on desktops and phones alike.

https://bugzilla.redhat.com/show_bug.cgi?id=1699269

This may explain the thousands of critical warnings and memory explosion in
https://gitlab.gnome.org/GNOME/gnome-software/issues/486

Relevant parts of the log:

    json_object_has_member: assertion 'member_name != NULL' failed
    g_strsplit: assertion 'string != NULL' failed
    g_strv_length: assertion 'str_array != NULL' failed

Although this belies a metadata generation bug, fall back to showing the
generic application icon rather than having a 'hole' in the UI where the icon
would normally be.

If an app switches from NEWS to AppStream <release> tags we don't want to show
multiple *years* of release notes on the next flatpak update.

As we can't know the current installed version, just do something more sane
than showing everything.

Fixes half of https://gitlab.gnome.org/GNOME/gnome-software/issues/263