Dock Preferences dialog issues

[Gabriel Dubatti]

* The Dock Preferences dialog does not show the Dock size options the first time is opened (you have to close and reopen it to show them). See the attached image.

* The Dock Preferences dialog does not show an icon in the dock and if you minimize it, it disappears and never shows up again. The dialog is not modal.

Dock version v0.85 (GTK3) from Ubuntu Mate 18.04 64 bits Beta 2 + updates.

I also reported the bug upstream: https://github.com/robint99/mate-dock-applet/issues/131

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mate-dock-applet 0.85-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: MATE
Date: Thu Apr 12 08:32:10 2018
InstallationDate: Installed on 2018-04-06 (5 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
SourcePackage: mate-dock-applet
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

[Expired for mate-dock-applet (Ubuntu) because there has been no activity for 60 days.]