Review Request 120471: Add Registry::sync() signal

[Sebastian Kügler]

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https://git.reviewboard.kde.org/r/120471/
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Review request for kwin, Plasma and Martin Gräßlin.


Repository: kwayland


Description
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Add Registry::sync() signal

Emitted when the Wayland display is done flushing the initial interface
callbacks, announcing wl_display properties. This can be used to compress
events. Note that this signal is emitted only after announcing interfaces,
such as outputs, but not after receiving callbacks of interface properties,
such as the output's geometry, modes, etc..
This signal is emitted from the wl_display_sync callback.

For this, we add a wl_callback_listener to the registry's Private,
enqueue its events properly, if necessary, and trigger the signal
through a callback mechanism similar to the wl_registry callbacks.

This signal allows users of the API to find out when the signal
emissions, such as outputAnnounced, etc. for all currently existing
interfaces is complete.


Diffs
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  src/client/registry.h 9e63a2b20c9734cc599f8c612441165b20d361bd 
  src/client/registry.cpp 22f948488b88f2a9fbf2fd78f0d223d05585fe17 

Diff: https://git.reviewboard.kde.org/r/120471/diff/


Testing
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tests in libkscreen exercise this feature, it works as expected, meaning I can notify when all initial synchronization is done.


Thanks,

Sebastian Kügler

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