it is not possible to open an existing remote file from the open dialog using the fish protocol.

in the opening dialog:
File name:fish://root@localhost/etc/hosts
results in:
hosts
File not found.
Please verify the correct file name was given.

however on the command line:
robert@lappi:~$ kate fish://root@localhost/etc/hosts

works fine.

on a side note:
on ubuntu 14.x kate allowed to open a non existing file, which was created when it was saved the first time.
Now I get exactly the same "File not found" dialog.

maybe the two peculiarities have a common root (if not it would be nice to reimplement this features)

robert

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: kate 4:14.12.3-0ubuntu2.1
ProcVersionSignature: Ubuntu 3.19.0-26.27-generic 3.19.8-ckt4
Uname: Linux 3.19.0-26-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Aug 9 09:30:30 2015
InstallationDate: Installed on 2015-06-05 (64 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: kate
UpgradeStatus: No upgrade log present (probably fresh install)