Revert "fix(xwayland): sync cursor global position to X server"

[zccrs]

Reverts #1430

It should not be implemented in this way, as this will cause Xwayland to send these events to X clients as genuine mouse
operations, which is not what we intend; we only wish for X to update the cursor coordinates.

Summary by Sourcery

Revert Xwayland cursor position synchronization to avoid generating unintended mouse events for X clients.

Bug Fixes:

• Stop warping the Xwayland pointer to mirror the Wayland cursor, preventing cursor synchronization from being reported to X clients as genuine mouse input.

Enhancements:

• Remove cursor-position monitoring and synchronization from WXWayland seat and startup handling.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Reverts the previous Xwayland cursor synchronization implementation by removing cursor tracking and XCB pointer warping, preventing global cursor updates from being delivered to X clients as genuine mouse events while retaining normal seat setup.

File-Level Changes

Change	Details	Files
Remove the cursor-position-to-Xwayland synchronization mechanism that generated synthetic pointer warps and cursor listeners.	Remove WCursor dependency and cursor synchronization state from WXWaylandPrivate. Delete cursor position change handling and XCB pointer-warp logic. Stop registering cursor watchers or performing initial cursor synchronization when Xwayland becomes ready. Preserve seat assignment through the native Xwayland API without the removed synchronization behavior.	waylib/src/server/protocols/wxwayland.cpp

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="waylib/src/server/protocols/wxwayland.cpp" line_range="430" />
<code_context>
-
-    d->watchSeatCursor();
-    d->syncCursorPositionToXWayland();
+        wlr_xwayland_set_seat(handle, seat->handle());
 }

</code_context>
<issue_to_address>
**Clearing the seat crashes compositor**

When a caller invokes `setSeat(nullptr)` while the Xwayland handle exists, `WXWayland::setSeat` evaluates `seat->handle()` unconditionally, dereferencing null before `wlr_xwayland_set_seat` can detach the seat and terminating the compositor.

Pass `nullptr` to `wlr_xwayland_set_seat` when `seat` is null; otherwise pass `seat->handle()`.
</issue_to_address>

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: zccrs, zzxyb

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
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[zccrs]

ArchLinux 的构建问题是Qt6.12的适配，本次暂不处理。