After closing the panel preferences, the panel was always hidden when
intelligent autohiding was selected. This patch adds a check whether the
currently active window actually overlaps with the panel and only hides
it in case it does.

ochosi: "Just to document the findings I made during a quick debug session
with the panel from git master (4.11.x). Intelligent hiding
generally works, but the mouse-pointer behavior is buggy.
Steps to reproduce the bug:
1) set panel to intelligent hiding
2) give a window focus that doesn't overlap with the panel
3) hover the panel with the mouse
4) upon leaving the panel hides again, even though there
   is no window overlapping

What it should do instead: if intelligent hiding is in use
it should check (possibly in panel_window_leave_notify_event
or _enter_ in panel-window.c) whether there are windows
overlapping with the panel and if not, the panel shouldn't
hide on leave_notify."

Rebased for the Gtk3 port by Simon Steinbeiss <simon@xfce.org>

Also add the textcellrenderer to the combobox in
settings and replace exo with native glib.

This configuration option only makes sense when not hiding a panel
automatically, so whenever one of the two autohide behaviors is enabled,
the option is now greyed out in the UI.

Rebased for the Gtk3 port by Simon Steinbeiss <simon@xfce.org>

Instead of a single "Show/hide panel automatically" check box, we now
use a "Automatically hide the panel" combo box with the options "Never",
"Intelligently" and "Always".

Rebased for the Gtk3 port by Simon Steinbeiss <simon@xfce.org>

We could write a migration script for it to avoid additional code being
added to the panel itself but the solution presented here is simple and
works: when a panel is created (e.g. during startup), we check whether
there is an old "autohide" property in the Xfconf channel. If the new
"autohide-behavior" property is not yet set, we translate "autohide"
FALSE and TRUE into "autohide-behavior" NEVER and ALWAYS, respectively.
We then reset the "autohide" property and thereby achieve an automatic,
transparent migration from old to new.

Rebased for the Gtk3 port by Simon Steinbeiss <simon@xfce.org>

This implementation of intelligent autohiding works as follows:

The current WnckScreen is monitored. Whenever the active window changes
or whenever the geometry of an already active window changes, the
algorithm checks whether the active window and the panel overlap. If
this is the case, the panel is hidden. Otherwise, it is made or remains
visible.

Desktop windows are treated special. Even though they overlap
with panels technically, we don't consider this relevant and always make
the panel visible when a desktop window becomes active.

Internally, there are three autohide behaviors now: never (disables
autohiding altogether), intelligent (implements the above method) and
always (the old "hide when not focused/grabbed by mouse or keyboard).

Rebased for the Gtk3 port by Simon Steinbeiss <simon@xfce.org>

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