Description of problem:
Cannot update tigervnc due to RPM dependency problems

Version-Release number of selected component (if applicable):
Upgrade from 1.8.0 to 1.9.0

How reproducible:
sudo dnf update

Steps to Reproduce:
sudo dnf update

Actual results:
» sudo dnf update
Last metadata expiration check: 0:04:26 ago on Sat 28 Jul 2018 12:14:52 IDT.
Dependencies resolved.

 Problem: package avahi-ui-tools-0.7-12.fc28.x86_64 requires vnc, but none of the providers can be installed
  - cannot install both tigervnc-1.9.0-1.fc28.x86_64 and tigervnc-1.8.0-10.fc28.x86_64
  - cannot install both tigervnc-1.8.0-7.fc28.x86_64 and tigervnc-1.9.0-1.fc28.x86_64
  - cannot install the best update candidate for package tigervnc-1.8.0-10.fc28.x86_64
  - cannot install the best update candidate for package avahi-ui-tools-0.7-12.fc28.x86_64
==================================================================================================================================================================================================================================
 Package                                               Arch                                                Version                                                     Repository                                            Size
==================================================================================================================================================================================================================================
Skipping packages with conflicts:
(add '--best --allowerasing' to command line to force their upgrade):
 tigervnc                                              x86_64                                              1.8.0-7.fc28                                                fedora                                               255 k
 tigervnc                                              x86_64                                              1.9.0-1.fc28                                                updates                                              273 k

Transaction Summary
==================================================================================================================================================================================================================================
Skip  2 Packages

Nothing to do.
Complete!

» sudo dnf update --best --allowerasing
Last metadata expiration check: 0:04:52 ago on Sat 28 Jul 2018 12:14:52 IDT.
Dependencies resolved.
==================================================================================================================================================================================================================================
 Package                                                    Arch                                               Version                                                  Repository                                           Size
==================================================================================================================================================================================================================================
Upgrading:
 tigervnc                                                   x86_64                                             1.9.0-1.fc28                                             updates                                             273 k
Removing dependent packages:
 avahi-ui-tools                                             x86_64                                             0.7-12.fc28                                              @fedora                                              63 k

Transaction Summary
==================================================================================================================================================================================================================================
Upgrade  1 Package
Remove   1 Package

Total download size: 273 k
Is this ok [y/N]: N
Operation aborted.


Expected results:


Additional info: