Do not unset cursor image when cursor enters a surface
Summary: From Wayland documentation: "When a seat's focus enters a surface, the pointer image is undefined and a client should respond to this event by setting an appropriate pointer image with the set_cursor request." KWin's interpretation so far for the undefined pointer image was to remove the pointer image when entering a surface waiting for the client to set a cursor image. This can result in a short flicker as there might be a frame without a cursor image. This patch changes the behavior by keeping the previous image till the application set a new one. This brings some advantages: * if the application is not responding a cursor is still shown * if the same cursor is used as in the previous window we don't have a flicker CCBUG: 393639 Test Plan: I cannot see the flicker, so only tested with the adjusted tests Reviewers: #kwin, #plasma Subscribers: kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D12631
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