Should the mini.pick default_show be improved?

[jellli]

The show method should only require defining a render style per line, not the entire buffer. The current design forces users to manage buffer-wide logic, resulting in unnecessary boilerplate. What's the rationale behind exposing the full buffer instead of just a line-level renderer?

[echasnovski]

The show method should only require defining a render style per line, not the entire buffer.

It might but it definitely shouldn't. The design here gives more freedom to users/sources to customize how all items to be shown are displayed. For instance, one of the behavior that is possible thanks to this is aligning all visible items (see #1192). It wouldn't have been possible if the interface was only for a single line.