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If I am correct, is this effectively implementing Material3 / Material You into the app / widget launcher icons?

That's something we should do I think, but I'm not sure how large of a change it is. I know @BrayanDSO has been steadily moving theming / theme improvements forward, so he may have already thought about this and may have ideas

If I'm correct that this is effectively system theming implementation for new theme features available in Android then I like the idea, if this is something that goes past Android theming then I'm less interested in the idea as custom / extra items quickly become a maintenance burden going forward and I resist adding things like that pretty strongly as we have limited maintenance resources vs current maintenance load

Coloring widgets with Material You colors is possible, yes. About my Material work, I'm waiting for 2.17 to be launched before I start the disruptive changes.

But this issue can be fixed already by anyone that wants to do the job (I'm personally not motivated to do this since I don't use themed icons)

Note: for anyone that wants to tackle this, the Add note widget have a lower priority because people using Android 7.1+ can use the Add shortcut, so the widget will probably be removed when we reach minSdk = 25.

如果能添加「统计」的任意的同步数据到桌面, 也许能令我更有动力.

I will to do it

I won't keep working on it, I'm sorry!

I am taking it up