[kfontview] [Bug 433710] New: wrong character in detail popup box on hidpi screen

[oldherl]

https://bugs.kde.org/show_bug.cgi?id=433710

            Bug ID: 433710
           Summary: wrong character in detail popup box on hidpi screen
           Product: kfontview
           Version: 5.21.1
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: oldherl at gmail.com
  Target Milestone: ---

Created attachment 136234
  --> https://bugs.kde.org/attachment.cgi?id=136234&action=edit
screenshot of the wrong character

SUMMARY

Point the mouse cursor to the characters when viewing a particular Unicode
block. A detail box pops out to show the character under the mouse cursor. But
it is the wrong character on my hidpi (2x) screen, and it's about half the
distance between the mouse cursor and the origin porint (top-left corner).

STEPS TO REPRODUCE
1. Use a hi-dpi (2x) screen setting.
2. Open a font with many characters in kfontview. For example, any of the Noto
Sans CJK font family.
3. Select a Unicode block with many characters.
4. Point the mouse cursor to a character and see the popup detail box.

OBSERVED RESULT

The character in the detail box is the one approximately at the middle of the
top-left corner and the cursor. See the attachment. The character in the orange
circle is not the one under the cursor (in the blue circle).

EXPECTED RESULT

The character in the popup box should be the one under the cursor (the blue
one).

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
Arch Linux
(available in About System)
KDE Plasma Version: 5.21.1
KDE Frameworks 5.79.0
Qt 5.15.2 (built against 5.15.2)
The xcb windowing system

ADDITIONAL INFORMATION

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