xdg-toplevel-drag-v1: add set_offset request

This request allows the client to change the offset hint without unmapping the toplevel. This is useful when the geometry of the toplevel changes while it is being dragged.

To avoid jank, the hint change is integrated with the commit sequence that changes the geometry.

Additionally, the client must now perform a commit after attaching a toplevel to ensure that the offset in the attach request is also in sync with the geometry of the window.

Signed-off-by: Julian Orth ju.orth@gmail.com

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Replaces !292 (closed)

Requirements for merging

• Review
• Implementations
  • Jay: https://github.com/mahkoh/jay/pull/286
• ACKs from members