client: Add FreezeHandle

[danieldg]

This also fixes some potential missed wakeups when using EventQueue methods in a multi-threaded application.

[danieldg]

See https://github.com/danieldg/smithay-client-toolkit/tree/freeze-popup for an example of use.

[codecov[bot]]

Codecov Report

Merging #530 (9fe0936) into master (1f38f9a) will decrease coverage by 0.81%. The diff coverage is 41.02%.

:exclamation: Current head 9fe0936 differs from pull request most recent head 4110177. Consider uploading reports for the commit 4110177 to get more accurate results

@@            Coverage Diff             @@
##           master     #530      +/-   ##
==========================================
- Coverage   76.60%   75.79%   -0.82%     
==========================================
  Files          50       50              
  Lines        6938     6986      +48     
==========================================
- Hits         5315     5295      -20     
- Misses       1623     1691      +68     

Flag	Coverage Δ
main	61.49% <0.00%> (-0.94%)	:arrow_down:
test--	80.57% <41.02%> (-1.15%)	:arrow_down:
test--server_system	63.06% <41.02%> (-0.50%)	:arrow_down:
test-client_system-	70.37% <41.02%> (-0.86%)	:arrow_down:
test-client_system-server_system	51.80% <41.02%> (-0.60%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
wayland-client/src/lib.rs	100.00% <ø> (ø)
wayland-client/src/event_queue.rs	48.40% <31.81%> (-13.70%)	:arrow_down:
wayland-client/src/conn.rs	91.66% <91.66%> (+0.92%)	:arrow_up:
wayland-backend/src/sys/client_impl/mod.rs	74.04% <0.00%> (-1.13%)	:arrow_down:
wayland-backend/src/rs/client_impl/mod.rs	79.73% <0.00%> (-0.57%)	:arrow_down:
wayland-backend/src/server_api.rs	69.59% <0.00%> (-0.41%)	:arrow_down:
wayland-backend/src/rs/server_impl/client.rs	75.69% <0.00%> (-0.19%)	:arrow_down:
wayland-scanner/src/client_gen.rs	99.19% <0.00%> (+<0.01%)	:arrow_up:
... and 2 more

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[danieldg]

Marked as draft, should rebase on #535 and possibly remove make_early_data depending on the fate of set_data.

[danieldg]

Removed make_early_data, since the primary use for it is no longer necessary due to #531.

[elinorbgr]

Ok so, coming back to this, I get the need for this I can't think of a better way to achieve it, so I plan to merge it. I believe the only remaining nitpick is about the name of the handle/guard?

[elinorbgr]

Thanks!