Replace the popup dialog we had here with going to the
details page. The improved back button handling lets us
go back to the installed page from there.

Add a stack, so we can go back from an application to the category
to the overview.

With the search entry now being only in the overview, we are
always going back to the overview when exiting search, so
no need to keep a search_back_id.

This makes page up/down work when you get to the page.
Also, scroll the overview back to the top every time.

Grabbing focus to a widget is a little tricky, since it
must be mapped for that to work. Add a utility function
that waits for that to happen.

This doesn't make a big difference, but it is the proper
way to show a window.

This improves keynav, and doesn't hurt.

For 3.10, we're just going to hardcode a list of eighteen
popular applications. These were chosen by Allan Day and
Ryan Lerch. We put them on a 3 day rotation, and scramble
them a  bit to make things more interesting. After 3.10,
we will look at getting this data online.

The three apps were chosen by Allan Day and Ryan Lerch. For
3.10, we're just going to hardcode gimp, gnome-weather and
gnome-sudoku as featured apps, and put them on a 3 day
rotation. After 3.10, we will look at getting this data
online.

These will be replaced by proper artwork soon.

This is important for accessibility, and there is really no reason
to treat this button different from all the others.

It is more confusing than helpful, because it might also
filter the installed list.

Too much red hurts the eyes.

Don't make install buttons blue, the mockups don't have that.
And add a way to remove the redness from the remove buttons,
since a wall of red is jarring.

This still needs wiring up to AppStream data, and some of the groups may have to
be renamed or removed.

This means if the same app is installed in one tab then the status is changed
in other tabs.

The vadjustment is controlling this, not the hadjustment.

This is actually counter-productive, as it selects the entry
contents, so if you are in the middle of typing something,
the text gets selected and then your next key press overwrites
it.

Also try to remove apps from the list after there removal
is complete.

This code was duplicated in almost all shell files.

At application start, we are calling refresh functions without
making the corresponding page current. To avoid unintended effects,
the refresh functions and their async callbacks must not change
the visibility of any shared ui elements unless the page is still
current.

Go back to the previous tabwhen search entry is cleared.

Make typing go to the search entry whenever it is visible, and
make Escape clear the entry.

Show the search bar also on the installed page, and move the
search entry signal handler to a better place.

This uses the newly introduced throbbing style. We only
put the emphasis on the button if we are not already on
the updates page.

This will be used to put emphasis on the updates button when
updates are available.

We can avoid the wait most of the time, by loading the
updates and installed lists at start. But we don't want
to slow down the loading of the overview page (which is shown
by default), so we only load the others when the overview
is fully loaded.

This will let us avoid slowing down the loading of the overview
by deferring the load of the other tabs until the overview is
fully loaded.

The overview is already the default mode, so no need
to set it explicitly when --mode overview is passed
on the commandline.

We should unref the GsApp that is shown in the details page
on shutdown.