[Differential] [Request, 5 lines] D3324: [Touchpad KCM] Prevent save dialog if no touchpad was found

[subdiff (Roman Gilg)]

subdiff created this revision.
subdiff added a reviewer: Plasma.
subdiff set the repository for this revision to rPLASMADESKTOP Plasma Desktop.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  If there is no touchpad found, the KCM will always ask if the settings are supposed to be saved because the widget gets changed although no options have and can be changed. This little patch prevents this.

TEST PLAN
  With and without touchpad.

REPOSITORY
  rPLASMADESKTOP Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D3324

AFFECTED FILES
  kcms/touchpad/src/backends/x11/xlibbackend.h
  kcms/touchpad/src/kcm/touchpadconfig.cpp
  kcms/touchpad/src/touchpadbackend.h

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: subdiff, #plasma
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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