This reverts commit bb8194a94310dae72bcbd745cd7f0f93e8d6fad1.

Commit cases a warning when closing atril window, see
https://github.com/mate-desktop/atril/pull/431#issuecomment-576002680
for more info

Test:
 $ sudo update-desktop-database /usr/share/applications

Diff:
$ ./autogen --prefix=/usr && make
$ cp data/atril.desktop data/atril.desktop.old
(changes)
$ ./autogen --prefix=/usr && make
$ diff data/atril.desktop.old data/atril.desktop
229c229
< X-MATE-Bugzilla-Version=@VERSION@
---
> X-MATE-Bugzilla-Version=1.23.1
233c233
< MimeType=@ATRIL_MIME_TYPES@
---
> MimeType=application/pdf;application/x-bzpdf;application/x-gzpdf;application/x-xzpdf;application/postscript;application/x-bzpostscript;application/x-gzpostscript;image/x-eps;image/x-bzeps;image/x-gzeps;application/x-dvi;application/x-bzdvi;application/x-gzdvi;image/vnd.djvu;image/vnd.djvu+multipage;image/tiff;application/x-cbr;application/x-cbz;application/x-cb7;application/x-cbt;application/vnd.comicbook+zip;application/vnd-comicbook.rar;application/oxps;application/vnd.ms-xpsdocument;application/epub+zip;

 ev_sidebar_thumbnails_document_changed_cb()

Clear the loading icon hash table if it already exists.

https://bugzilla.gnome.org/show_bug.cgi?id=770070

origin commit:
https://gitlab.gnome.org/GNOME/evince/commit/702c7c6

origin commit:
https://gitlab.gnome.org/GNOME/evince/commit/a182f12

The memory leak was caused by a g_signal_connect
which was never disconnected. This patch makes
sure the signal is disconnected and the job is
cancelled before creating another rendering job.
It additionally introduces a helper function to
cleanly finalize the job.

origin commit:
https://gitlab.gnome.org/GNOME/evince/commit/939c434