Seed deCONZ group color modes from unreachable lights too

[marcus13371337]

Proposed change

deCONZ group entities derive supported_color_modes once, at creation, from the colour state merged from their member lights. Only reachable lights were merged. A group whose bulbs were off at the wall during Home Assistant startup therefore came up as on/off only and stayed that way until the integration was reloaded.

deCONZ keeps the last known bri, ct, hue, sat and xy for unreachable lights, so this change merges every member light. Reachable lights are merged last so their current values win over stale ones from unreachable lights. Later updates still flow through async_update_callback as before.

Adds a test with a colour temperature bulb that is unreachable at setup and asserts that the group still supports color_temp. The test fails on dev without the change.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes deCONZ group light loses brightness and color temperature when its bulbs are unreachable during startup #185116
• This PR is related to issue: [deconz] dimmable light groups have no brightness attribute #115633, deconz light groups no longer dimmable after update from 2024.8 to 2024.10 #128850
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

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[home-assistant]

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[home-assistant]

Hey there @Kane610, mind taking a look at this pull request as it has been labeled with an integration (deconz) you are listed as a code owner for? Thanks!

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Stale

[Kane610]

Nice! Thanks