When using "make -j [N > 1]", the install-icons/uninstall-icons and
update-icon-cache make targets were running concurrently.  Move the
icon cache updating to data/Makefile.am to ensure it runs AFTER the
icons are installed or uninstalled.

This adds a "close-alert" signal to EShellWindow, which is bound to
GDK_KEY_Escape.  The default handler closes view-specific alerts first,
then global alerts.

(cherry picked from commit 161df81d)

Closes the active EAlert and returns TRUE, or else returns FALSE if
there is no active EAlert.

(cherry picked from commit 2ecce97b)

While all the code references fill_color_rgba, the object itself
defined property's name "fill_rgba", which produced runtime
warnings and misbehavior.

An address book editor error was shown about active EShell's window,
which means switching to other application and back made the editor
in the background, but, more importantly, the editor could be
selected and the error was in the background, thus it seemed like
being stuck, it didn't respond to any button click, until the error
was dismissed.

(cherry picked from commit 20a97f4d)

Commit 1556f4d4 in 3.8.4 broke inline
PGP encrypted messages, because the parser was treating the encrypted
message content as an attachment even though the content type is just
text/plain.  This ensures the message content is treated correctly.

(cherry picked from commit ca67414c)

https://bugzilla.gnome.org/show_bug.cgi?id=386113