In GTK+ Look-And-Feel, Slider Controls Have No Visible Handle

[Aere Greenway]

When using the GTK+ look-and-feel, slider controls have no visible handle you can click-on with the mouse, and drag.

If you click in the slider area below the displayed number, and drag, it acts like there is a handle there, but you just can't see it.

I expected to see a visible slider control handle in the GTK+ look-and-feel, which happens on the Nimbus and Metal look-and-feel (I didn't try others), but it is not visible in the GTK+ look-and-feel.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: openjdk-11-jre 10.0.1+10-3ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat May 5 16:09:05 2018
InstallationDate: Installed on 2016-04-24 (741 days ago)
InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Release amd64 (20160421)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: openjdk-lts
UpgradeStatus: Upgraded to bionic on 2018-05-02 (3 days ago)

[Tiago Stürmer Daitx (tdaitx)]

Thank you for taking the time to report this bug and helping to make Ubuntu better.

It's not clear what application you were trying to run. Could you please try running the java application by adding -Djdk.gtk.version=2 to the java command line and report back if that helps?

This seems to be related to bug #1770278. That reports includes a couple screenshots, could you please take a look and report back if it is similar to what you are seeing?

[Aere Greenway (aere)]

On 05/18/2018 07:53 AM, Tiago Stürmer Daitx wrote:
> Thank you for taking the time to report this bug and helping to make
> Ubuntu better.
>
> It's not clear what application you were trying to run. Could you please
> try running the java application by adding -Djdk.gtk.version=2 to the
> java command line and report back if that helps?
>
> This seems to be related to bug #1770278. That reports includes a couple
> screenshots, could you please take a look and report back if it is
> similar to what you are seeing?
>
>
> ** Changed in: openjdk-lts (Ubuntu)
> Status: New => Incomplete
>
It will occur with any application using the GTK+ look-and-feel, that
has slider controls.  In this case, it is the KeyMusician Keyboard.  I
can give you a free-trial copy, if you need.

I have attached two screenshots.

The first, was taken running the application using the
"-Djdk.gtk.version=2" option.

The second, was taken running the application without the above option,
using whatever JDK is used by default on Ubuntu 18.04.

--

Sincerely,
Aere

[Aere Greenway (aere)]

The first screenshot (using the "-Djdk.gtk.version=2" option) shows the application screen the way it should appear. The slider controls (in the right pane) all have a handle which can be 'grabbed' by the mouse, and dragged.

The second screenshot (without the above option), shows the same screen, with the problem clearly evident. None of the slider controls (in the right pane) have a 'handle' visible (which could be dragged using a mouse). Yet if you click and drag in the slider control where the handle should be visible, it behaves as if a visible handle were there.

[Launchpad Janitor (janitor)]

[Expired for openjdk-lts (Ubuntu) because there has been no activity for 60 days.]

[Aere Greenway (aere)]

To my knowledge, I supplied all of the information you requested. What more do you need?

Ignoring this bug means that applications can no longer use the GTK+ look-and-feel. Is it truly being abandoned? If so, I will alert our users to use the Nimbus look-and-feel instead.

That is unfortunate, because I really preferred the GTK+ look-and-feel. But if it can no longer be supported, so be it.

[twak (twak)]

This affects me. Aere has given a great description - is there any more information I can provide?