Add projectile-discard-root-cache command (#1936)

The existing projectile-invalidate-cache always tries to also clear
the per-project files cache, which means it either prompts for a
project (with prefix arg) or only operates when you're already in a
project.  Users who just created a marker file in a directory that
Projectile previously considered rootless ended up picking an
unrelated project from the prompt just to get the root cache
flushed.

projectile-discard-root-cache is a focused alternative that empties
projectile-project-root-cache only.  Wired into the menu next to the
existing 'Invalidate cache' entry; deliberately not bound on the
prefix map since the keymap is already dense.

1 files changed, 1 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a906264..3e16240 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 
 ### New features
 
+* [#1936](https://github.com/bbatsov/projectile/issues/1936): Add `projectile-discard-root-cache` command to clear `projectile-project-root-cache` without touching other Projectile caches. Useful after creating or removing a project marker, since the existing `projectile-invalidate-cache` either also drops the file list cache or prompts for a project depending on context.
 * Warn once per session when `projectile-indexing-method' is `alien' but the project has a non-empty `.projectile' file, so users notice their dirconfig rules are being bypassed. Controlled by the new `projectile-warn-when-dirconfig-is-ignored' option.
 * Warn when a `+' keep entry in `.projectile' contains glob metacharacters. The `+' prefix is for subdirectory paths only and globs are silently coerced into a non-matching directory name; the warning surfaces the misuse rather than letting it fail silently.
 * [#1964](https://github.com/bbatsov/projectile/issues/1964): Implement `project-name` and `project-buffers` methods for the `project.el` integration, so that code using `project.el` APIs returns correct results for Projectile-managed projects.