[kmail2] [Bug 423909] New: KMail perceives cursor location to be vertically offset from where Wacom Bamboo graphic tablet's cursor is visible

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https://bugs.kde.org/show_bug.cgi?id=423909

            Bug ID: 423909
           Summary: KMail perceives cursor location to be vertically
                    offset from where Wacom Bamboo graphic tablet's cursor
                    is visible
           Product: kmail2
           Version: 5.14.2
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: no-spam-134 at q.com
  Target Milestone: ---

SUMMARY
KMail perceives cursor location to be vertically offset by one inch from where
Wacom Bamboo graphic tablet's cursor is visible.


STEPS TO REPRODUCE
1. Start Kmail
2. Move the graphic tablet's cursor into the KMail window

Reproducible 100% of the time.


OBSERVED RESULT
KMail perceives cursor location to be vertically offset by one inch from where
Wacom Bamboo graphic tablet's cursor is visible.


EXPECTED RESULT
The area where KMail perceives the cursor to be should be exactly the same as
where the graphic tablet's cursor is visible.


SOFTWARE/OS VERSIONS
KMail2 Version 5.14.2 (20.04.2)
Linux Kernel Version: 5.3.18-lp152.19-default
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.71.0
Qt Version: 5.12.7
xf86-input-wacom Version: 0.34.2-lp152.4.6
libwacom2 Version: 1.1-lp152.2.5
libwacom-data Version: 1.1-lp152.2.5
Distro: openSUSE Leap 15.2 for X86_64


WACOM GRAPIC TABLET DETAILS
Wacom Bamboo Pen Model MTE-450A set to Absolute Mode (problem also happens in
Relative mode)
Wacom Bamboo USB Vendor ID: 0x56a
Wacom Bamboo USB Product ID: 0x65
Wacom Bamboo USB Revision: 0.00


ADDITIONAL INFORMATION
I did a fresh install of openSUSE Leap 15.2 on 2020-Jul-04 (the latest and most
current openSUSE version as of this report) and discovered there is a problem
using a Wacom Bamboo tablet with KMail Version 5.14.2 (20.04.2).

Whenever the graphic tablet's cursor is in the KMail window, the area where
KMail perceives I am pointing is vertically offset by one inch below where the
graphic tablet's cursor is visible on my 23 inch screen.

For example, when I see my tablet's cursor hovering over the topmost message in
the Message List, KMail highlights the message 3 rows below, showing KMail
perceives I am pointing at the forth row from the top in the Message List,
instead of perceiving I am pointing at the topmost message as it should. The
same behavior presents in the Folders column. This makes KMail unusable with
the graphic tablet, as I can not select any email message higher than the forth
row. The icons in the toolbar are completely inaccessible by the graphic
tablet's pointer and can not be activated.  The menu bar is completely
inaccessible by the graphic tablet's pointer and can not be activated. The same
offset behavior happens when using the scroll bar button (thumb bar).

The graphic tablet's pointer offset behavior is not presenting in any other
application I used. This behavior was not present in any version of KMail from
openSUSE Leap 15.0 or older.

When I connect a mouse to my system, the area where KMail perceives the mouse
is pointing is the same as where the mouse cursor is visible, as it should be,
and all functionality is accessible.

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