https://bugs.kde.org/show_bug.cgi?id=410378

            Bug ID: 410378
           Summary: can't use Spectacle's Area dropdown with mouse on
                    primary monitor
           Product: Spectacle
           Version: 18.12.2
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: m...@baloneygeek.com
          Reporter: skierp...@gmail.com
                CC: k...@david-redondo.de
  Target Milestone: ---

Created attachment 121826
  --> https://bugs.kde.org/attachment.cgi?id=121826&action=edit
Spectacle spans my upper and lower (primary laptop) displays. Note no dropdown
menu highlight.

SUMMARY
On my X11 Fedora KDE Spin desktop, clicking with the mouse on Spectacle's Area
dropdown field brings up the menu (Full Screen (All Monitors), Current Screen,
... Rectangular Region), but I can't highlight or choose any of its items with
the mouse. But this only happens on my primary laptop monitor, the Area
dropdown menu works fine with the mouse on my secondary monitor.

STEPS TO REPRODUCE
1. Plug external monitor into laptop, in the Displays System Settings Module
configure it as second monitor.
2. Start Spectacle. It should appear on the primary laptop display, otherwise
drag it there.
3. With mouse, click on the Area: dropdown, try to choose from the menu.
4. Now drag Spectacle to the external monitor and repeat step 3.

OBSERVED RESULT
On my primary (laptop) monitor, the dropdown menu appears but the items don't
highlight as I move the cursor over them and clicking them does not choose the
item or dismiss the menu. But it works fine on my external (secondary) monitor.
Other drop-down menus in Spectacle ([Help v] [Tools v] [Export v] [Save As...
v] work fine.

EXPECTED RESULT
The dropdown menu should work on both displays.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.59.0
Qt Version: 5.12.4, using xcb

ADDITIONAL INFORMATION
The workaround is to drag Spectacle to the second monitor, or use the cursor
keys.
My external display is an Acer B243PWL 1920x1200 over DisplayPort and my laptop
screen is Thinkpad T460 1920x1080 (i.e. both have the same horizontal
resolution). System Settings > Displays > Scale Display is 1.1 for both
monitors. Windows have the same number of pixels on each display (see the
screenshot with Spectacle spanning both displays), they appear larger on the
external display because it's bigger.

This sounds a bit like bug 363548.

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