[systemsettings] [Bug 313067] New: left-handed mouse-mode is not changing XInput button mapping

[h.goebel at crazy-compilers.com]

https://bugs.kde.org/show_bug.cgi?id=313067

            Bug ID: 313067
           Summary: left-handed mouse-mode is not changing XInput button
                    mapping
    Classification: Unclassified
           Product: systemsettings
           Version: unspecified
          Hardware: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: kcm_mouse
          Assignee: unassigned-bugs at kde.org
          Reporter: h.goebel at crazy-compilers.com
                CC: unassigned-bugs at kde.org

When switching the mouse to left-handed mode (using systemsettings), only
Core-Events are changed, not XInput events.

a) This is yields to problems with programs using XInput, e.g. for supporting
different input devices. See below for a example program.
b) Solving this issue would be a step towards solving bug 244736 - "Changing
mouse buttons order from Systemsetting modifies all input devices settings", as
XInput settings can be set for each device.

Expected behavior
==================

Instead of modifying core-event settings, KDE should modify XInput settings.
(Until the settings GUI supports selecting the device, as an intermediate
solution, XInput settings could be set for all mouse devices.)

Reproducible: Always

Steps to Reproduce:
Steps to Reproduce
==================

1) Preparation: Get the XInput-ID of your mouse

$ xinput list | grep -i pointer
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ HID 046a:0023                             id=9    [slave  pointer  (2)]
⎜   ↳ Microsoft Microsoft USB Wireless Mouse    id=10   [slave  pointer  (2)]

---> spot the id, in this case it is 10

2) Make sure KDE mouse settings is set to right-handed mode (which is the
default)
3) Verify expected behavior
3.1) Physically left button is button 1, Physically right button is button 3
   xev | grep -A3 Button
3.2) check xinput button mappings
$ xinput get-button-map 10
1 2 3 4 5 6 7 8 9 10 11 12 13

--> buttons are not switched (as expected)

4) Switch KDE mouse settings to left-handed mode.
5) Check behavior
5.1) Physically right button is button 1, physically left button is button 3
(as expected)
   xev | grep -A3 Button
5.2) check xinput button mappings
$ xinput get-button-map 10
1 2 3 4 5 6 7 8 9 10 11 12 13

--> buttons are still not switched (in XInput)

For proofing, this is a problem, use xournal <http://xournal.sourceforge.net/>.
6) Still in left-handed mode, start xournal
7) Ensure "Options -> Use XInput" (in xournal) is enabled (which is the
default)
8) Click on some icons in the toolbar using button 1 (physically right) ->
works
9) Try to draw some line in the main area of the window using button 1
(physically right) -> does not work
10) Try to draw some line in the main area of the window using button 3
(physically left) -> works, but is wrong button
11) Now disable "Options -> Use XInput"
11.1) Toolbar elements are still working when clicked by button 1 (physically
right) (as expected)
11.2) Drawing is now possible using using button 1 (physically right)

This shows, the misbehavior in xournal is reasoning in KDE not changing XInput
but core events.

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