lf improvements (#1477)

* Remove and merge duplicate entries

The 'case' statement had two identical commands for opening files using
`zathura`. Removed the extra match patterns and merged into one.

* Fix file checks

* Fix indentation and use the same syntax style

All the indentation are fixed. All syntax styles have been set to match
the first occurrence.

* Slightly faster filename generation for thumbnails

Use `md5sum` instead of `sha256sum` since the hash
is only used as a cache identifier (no security/integrity requirement).

Remove the trailing “  -” that `md5sum` prints for stdin by trimming
everything after the first space using POSIX parameter expansion (${var%% *}),
avoiding extra processes like `cut` or `awk`.

0 files changed, 0 insertions, 0 deletions