[wayland] Queue XDG configure requests when resizing toplevel interactively
Summary: When resizing a window particularly from the left side, we need to co-ordinate moving the window with when we get the resized buffer. The code in AbstractClient::handleMoveResize checks isWaitingForResizSync to make sure we never send more than one resize request at a time to keep that in sync. This makes sense on X and wl_shell_surface, but not on XDGShell where we can track which resize events have been handled by the client. ShellClient already keeps a stack of our pending configure requests and handles everything appropriately, we don't need to block. This results in a smoother dragging experience and avoids a potential deadlock currently seen when a client may not reply to a no-op configure request. CCBUG: 403376 Test Plan: Async ack handling is covered by existing unit tests Reviewers: #kwin, zzag Reviewed By: #kwin, zzag Subscribers: zzag, kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D20397
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