Snippets for cosmic-app-library 1.7.0 from Alpine aarch64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-aarch64/community/cosmic-app-library/cosmic-app-library-1.7.0-r0.log.

• warning: unused import: `ListColumn`
    --> src/app.rs:19:22
     |
  19 | use cosmic::widget::{ListColumn, reorderable_flex_row};
     |                      ^^^^^^^^^^
     |
     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
  

• warning: unused import: `Column`
    --> src/app.rs:80:15
     |
  80 |         self, Column,
     |               ^^^^^^