Unable to delete file from Meld on flash drive or over SSH - "g-io-error-quark: Unable to find or create trash directory (15)"

[Norbert]

Steps to reproduce:
   1. Local FS
   1.1. Start Meld (for example from console 'sudo meld /media/user/FLASH/apt/ /etc/apt/')
   1.2. Launch comparison
   1.3. Try to delete some_file from left side (represents "/media/user/FLASH/")
   1.4. Get error
   "Error deleting /media/user/FLASH/apt/some_file
   g-io-error-quark: Unable to find or create trash directory (15)"

   Please note:
   Usb flash (mounted on /media/user/FLASH) is writeable.
   Trash folder exists on flash (it is /media/user/FLASH/.Trash-1000).

2. Remote FS
   Steps to reproduce:
   2.1. Mount two folders for comparison with `sshfs user@host1:/ ~/folder1` and `sshfs user@host2:/ ~/folder2` as user with id=1000 (and on hosts id=1000)
   2.2. Run Meld with `meld ~/folder1 ~/folder2`
   2.3. Try to delete file
   2.4. Get error
   "Error deleting /home/user/folder1/some_file
   g-io-error-quark: Unable to find or create trash directory (15)"

   Please note:
   user ids is everywhere 1000, user is able to create and delete files over SSHfs on folder1 and folder2

Expected results:
   User is able to delete files from Meld.

Actual results:
   User is unable to delete file from Meld.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: meld 3.14.2-1
ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
Uname: Linux 4.4.0-72-generic i686
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: i386
CurrentDesktop: GNOME-Flashback:Unity
Date: Mon Apr 17 12:35:59 2017
InstallationDate: Installed on 2011-06-25 (2122 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
SourcePackage: meld
UpgradeStatus: Upgraded to xenial on 2017-04-17 (0 days ago)

[Norbert (nrbrtx)]

Got this bug again on Xenial while comparing of two SSHFS folders mounted as normal user.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Matthew Hitchcock (myflight72510)]

This bug also effects me. Comparing two folders on separate hard disk drives. Unable to delete files. Attempting to delete via right-click menu or delete key results in: g-io-error-quark: Unable to find or create trash directory for [foldername]

Ubuntu 18.04 -> Peppermint 10

Meld 3.18.0-6