Support for Mutter 45/libmutter-13 is broken

[pimvullers]

What Happened?

Build of wingpanel (on Gentoo Linux) against Mutter 45/libmutter-13 failed:

../wingpanel-8.0.0/wingpanel-interface/FocusManager.vala:136.25-136.32: error: initializer list used for unknown type
  136 |                         { x, y }
      |                         ^~~~~~~~
../wingpanel-8.0.0/wingpanel-interface/FocusManager.vala:131.21-137.21: error: 1 extra arguments for `bool Meta.Window.begin_grab_op (Meta.GrabOp, Clutter.InputDevice?, Clutter.EventSequence?, uint32)'
  131 |                     window.begin_grab_op (
      |                     ^~~~~~~~~~~~~~~~~~~~~~
  132 |                         Meta.GrabOp.MOVING,
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  133 |                         event.get_device (),
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  134 |                         event.get_event_sequence (),
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  135 |                         event.get_time (),
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  136 |                         { x, y }
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  137 |                     );
      | ~~~~~~~~~~~~~~~~~~~~~ 
Compilation failed: 2 error(s), 0 warning(s)

Looks like similar fix as for Gala is required: see elementary/gala#2039

Steps to Reproduce

1. Build wingpanel against Mutter 45
2. Build fails

Expected Behavior

Build passes

OS Version

Other Linux

Software Version

Latest release (I have run all updates)

Log Output

No response

Hardware Info

No response

[pimvullers]

Build confirmed to work with Mutter 46/libmutter-14 on Gentoo (however this is not available in stable).

[pimvullers]

wingpanel-8.0.0_mutter45.patch.gz
Attached patch fixes the build issue with Mutter45