Trash Docklet doesn't open Thunar

The same thing was annoing me for the last week....

I'm using Arch+XFCE. So what I found.

Running Plank in terminal were giving me next errors:
[CRITICAL 15:19:27.034831] [System:201] No application is registered as handling this file
[CRIICAL 15:19:27.034867] [System:206] Unable to use application/file '(null)' for execution.

As Plank relies on GVFS i tried
$ gvfs-open trash://
and the command returned error like "No application is registered as handling this file".

It means we need register application (Thunar) to open 'trash://' URI (here I should say, that with Gnome FM installed there were no problems at all) in GVFS.

I found this article https://help.ubuntu.com/community/DefaultFileManager
tl;tr
last chapter "One more way - for "mousemonkeys", like me" told to open "Preffered applications" manager, where Thunar was already set up as default FM, i closed the window, and OMG the Trash docklet opened the trash folder as well as $ gvfs-open trash://. Still works.

Funny .... yeah...

And a short addition
1. Read Arch wiki (hope works for Mint)
   https://wiki.archlinux.org/index.php/Default_applications
   https://wiki.archlinux.org/index.php?title=Desktop_entries&redirect=no

If TL;TR, bind x-scheme-handler/trash MIME type to file manager desktop entry

$ gvfs-mime --set x-scheme-handler/trash exo-file-manager.desktop
where exo-file-manager.desktop is
[Desktop Entry]
Version=1.0
Type=Application
Exec=exo-open --launch FileManager %u
Icon=system-file-manager
StartupNotify=true
Terminal=false
Categories=Utility;X-XFCE;X-Xfce-Toplevel;
OnlyShowIn=XFCE;
X-XFCE-MimeType=inode/directory;x-scheme-handler/trash;
_Name=File Manager
_Comment=Browse the file system

or

$ gvfs-mime --set x-scheme-handler/trash Thunar-url.desktop
Where Thunar-url.desktop is
[Desktop Entry]
Name=Thunar File Manager
Comment=Browse the filesystem with the file manager
GenericName=File Manager
Exec=thunar %u
Icon=Thunar
Terminal=false
StartupNotify=true
Type=Application
Categories=System;Utility;Core;GTK;FileTools;FileManager;

Ok i tried the 'terminal-mouse-monkey'...:D
Just do in terminal...

exo-preferred-applications

then switch to Utilities tab and select File Manager you prefer. And that's all! Now it's working.

So, what we do with this Bug report...is it related to Linux Mint, Plank or a combination of two? I mean, now it works for me but not by default...not every user may read this and expect it to work right after install.