[PATCH RFC 0/1] an extensible SetUIInfo2 design

Currently, the `SetUIInfo` method cannot set a refresh rate.
Simply adding a refresh_rate argument would break the method signature.

This RFC adds the `SetUIInfo2` method and `QemuUIInfoTypes` property.
  * `SetUIInfo2` takes a dictionary,
    allowing partial updates and adding more keys in the future.
  * `QemuUIInfoTypes` exposes the schema of `SetUIInfo2`'s argument.

This patch is a proof-of-concept and it needs further discussion on:
  * public API design (the name and the signature)
  * partial update behavior (only updating the recognized fields)
  * error handling (ignore the wrong keys or return an error?)

Test results:
  * qemu:qtest-x86_64/dbus-display-test passed
  * qemu:qtest-x86_64/dbus-vmstate-test passed
  * qemu:qtest-x86_64/dbus-vnc-test SKIP
  * manually created a virtual machine
    and successfully set its refresh rate and resolution via `SetUIInfo2`

Chengyang Zhu (1):
  ui/dbus: add extensible SetUIInfo2 method

 ui/dbus-console.c    | 56 ++++++++++++++++++++++++++++++++++++++++++++
 ui/dbus-display1.xml | 17 ++++++++++++++
 2 files changed, 73 insertions(+)

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2.55.0