Thunderbird Android: Implement edge-to-edge design

[apricotbucket28]

Thunderbird for Android currently handles edge-to-edge by padding most views. It would be great if the app adopted a more modern look by following current Android design guidelines.

Resources:

https://developer.android.com/design/ui/mobile/guides/layout-and-content/edge-to-edge

https://developer.android.com/design/ui/mobile/guides/foundations/system-bars

[Jon]

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