[Bug 1760325] [NEW] Unresponsive scrollbars in application categories of Application Dashboard widget

[anj]

Public bug reported:

Ubuntu release:

Ubuntu Bionic Beaver (development branch), but the problem also occurs
in Kubuntu 17.10 if upgraded to Plasma 5.12 through the backports PPA.

Package version:

plasma-desktop:
  Installed: 4:5.12.4-0ubuntu1
  Candidate: 4:5.12.4-0ubuntu1
  Version table:
 *** 4:5.12.4-0ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

What I expect to happen:

Application categories with more applications than will fit on one page
naturally get a scrollbar. I expect this scrollbar to turn blue/display
some other "hover decoration" when moused over and to respond to
clicking and dragging.

What happens instead:

Nothing. Clicking the scrollbar in (say) my rather large Games category
has the same effect as clicking on an empty space in the Application
Dashboard widget; i.e., it just exits the widget.

Please note: the scrollbar in the All Applications page DOES work; it's
only the scrollbars for the regular categories (as specified in a .menu)
file that do not.

Also, scrolling with the mouse wheel still works, and the scrollbars
(while unresponsive to clicking) will move correctly when doing so.

I wish I had any logs to provide but I don't know where this would be
logged, if anywhere.

It still works on my Kubuntu 17.10 install with Plasma 5.10.

Using Xorg.

** Affects: plasma-desktop (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1760325

Title:
  Unresponsive scrollbars in application categories of Application
  Dashboard widget

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