D6741: [client] Properly track enteredSurface in Keyboard

[Martin Flöser]

graesslin created this revision.
Restricted Application added projects: Plasma on Wayland, Frameworks.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  ASAN found a heap-use-after-free when deleting the focused keyboard
  surface in the client library. Keyboard did not track the lifetime of
  the focused surface and thus one can access already freed memory.

TEST PLAN
  Adjusted auto test to verify the variable gets cleared

REPOSITORY
  R127 KWayland

BRANCH
  keyboard-entered-surface-cleanup

REVISION DETAIL
  https://phabricator.kde.org/D6741

AFFECTED FILES
  autotests/client/test_wayland_seat.cpp
  src/client/keyboard.cpp

To: graesslin, #frameworks, #plasma
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein, lukas
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