Because treemacs--last-error-persist-file is defined with defconst, its
default value will overwrite our custom one once the
treemacs-persistence package is loaded.
projectile-project-root no longer returns `default-directory` if not in
a project (it returns nil). As such, doom-project-* functions (and their
uses) have been refactored.
+ doom-project-p & doom-project-root are aliases for
projectile-project-p & projectile-project-root.
+ doom-project-{p,root,name,expand} now has a DIR argument (for
consistency, since projectile-project-name and
projectile-project-expand do not).
+ The nocache parameter is no longer necessary, as projectile's caching
behavior is now more sane.
+ Removed some projectile advice/hacks that are no longer necessary.
+ Updated unit tests
Can be disruptive if you've got many windows with buffers across
different projects. Also, SPC o P is available to "jump to current file"
in the treemacs window.
This has proven intrusive, especially when you have files from different
projects open and you switch between them rapidly. Enabling
treemacs-follow-mode is left up to the user. Otherwise, the SPC o P
keybind and treemacs-find-file command can this manually and on-demand.
Also remove hide-mode-line-mode from treemacs because it's redundant
with the doom-themes treemacs icon theme.
Alexander-Miller/treemacs#212 introduced treemacs-persist-file, which we
now use instead of tools/treemacs' old treemacs-persistence hack (which
didn't work).
Relevant to #669
