Change working tree files and commit files panels to use filtering
(reducing the list) instead of search (highlighting matches). This
matches the behavior of other filterable views.
The text filter matches against the full file path, not just the
filename, which is more useful for navigating large directory trees.
When toggling a directory for a custom patch while a text filter is
active, all files in the directory are included (not just the visible
filtered ones), consistent with how staging a directory in the files
panel works.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
We will need a user config in the file tree in the next commit, and passing the
entire common is the easiest way to do that while ensuring hot-reloading when
users change the config while lazygit is running.
We've been sometimes using lo and sometimes using my slices package, and we need to pick one
for consistency. Lo is more extensive and better maintained so we're going with that.
My slices package was a superset of go's own slices package so in some places I've just used
the official one (the methods were just wrappers anyway).
I've also moved the remaining methods into the utils package.
