* feat(statusline): add the file type (language id) to the status line
* refactor(statusline): move the statusline implementation into an own struct
* refactor(statusline): split the statusline implementation into different functions
* refactor(statusline): Append elements using a consistent API
This is a preparation for the configurability which is about to be
implemented.
* refactor(statusline): implement render_diagnostics()
This avoid cluttering the render() function and will simplify
configurability.
* feat(statusline): make the status line configurable
* refactor(statusline): make clippy happy
* refactor(statusline): avoid intermediate StatusLineObject
Use a more functional approach to obtain render functions and write to
the buffers, and avoid an intermediate StatusLineElement object.
* fix(statusline): avoid rendering the left elements twice
* refactor(statusline): make clippy happy again
* refactor(statusline): rename `buffer` into `parts`
* refactor(statusline): ensure the match is exhaustive
* fix(statusline): avoid an overflow when calculating the maximal center width
* chore(statusline): Describe the statusline configurability in the book
* chore(statusline): Correct and add documentation
* refactor(statusline): refactor some code following the code review
Avoid very small helper functions for the diagnositcs and inline them
instead.
Rename the config field `status_line` to `statusline` to remain
consistent with `bufferline`.
* chore(statusline): adjust documentation following the config field refactoring
* revert(statusline): revert regression introduced by c0a1870
* chore(statusline): slight adjustment in the configuration documentation
* feat(statusline): integrate changes from #2676 after rebasing
* refactor(statusline): remove the StatusLine struct
Because none of the functions need `Self` and all of them are in an own
file, there is no explicit need for the struct.
* fix(statusline): restore the configurability of color modes
The configuration was ignored after reintegrating the changes of #2676
in 8d28f95.
* fix(statusline): remove the spinner padding
* refactor(statusline): remove unnecessary format!()
