bug#59165: 29.0.50; [PATCH] Ibuffer directory filter not buffer aware

[Gabriel <gabriel376@hotmail.com>]

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Description:
The ibuffer directory filter is not buffer aware for buffers not
visiting files. This bug seems to be introduced by commit 3ef18c7a213,
which made the `default-directory` no longer run within
`with-current-buffer`.

Steps:
1. emacs -Q (29.0.50 master d04433b96215d7d3387573f19cc315de86f2341a)
2. M-x dired /home/myuser/foo
3. M-x compile ls -lha
4. M-x ibuffer
5. / F /home/myuser/foo

Expected: filter is applied and two buffers are shown: `foo` and
`*compilation*`.

Actual: only buffer `foo` is shown.

Patch:
Below there is a proposed patch. I did a quick inspection and could not
find similar regressions in other ibuffer filters.


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From 94e2f3f37b1d807af50c9014b57d24661fb3c5bd Mon Sep 17 00:00:00 2001
From: Gabriel do Nascimento Ribeiro <gabriel376@hotmail.com>
Date: Thu, 10 Nov 2022 06:11:03 -0300
Subject: [PATCH 1/1] Make ibuffer directory filter buffer aware

* lisp/ibuf-ext.el (define-ibuffer-filter): Make ibuffer directory
  filter buffer aware for buffer not visiting files.
---
 lisp/ibuf-ext.el | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lisp/ibuf-ext.el b/lisp/ibuf-ext.el
index 6b5cccec51..adffef4325 100644
--- a/lisp/ibuf-ext.el
+++ b/lisp/ibuf-ext.el
@@ -1336,10 +1336,12 @@ directory
 matches against the value of `default-directory' in that buffer."
   ( :description "directory name"
     :reader (read-from-minibuffer "Filter by directory name (regex): "))
-  (if-let ((it (with-current-buffer buf (ibuffer-buffer-file-name))))
-      (when-let ((dirname (file-name-directory it)))
-        (string-match qualifier dirname))
-    (when default-directory (string-match qualifier default-directory))))
+  (with-current-buffer buf
+    (if-let* ((filename (ibuffer-buffer-file-name))
+              (dirname (file-name-directory filename)))
+        (string-match qualifier dirname)
+      (when default-directory
+        (string-match qualifier default-directory)))))
 
 ;;;###autoload (autoload 'ibuffer-filter-by-size-gt  "ibuf-ext")
 (define-ibuffer-filter size-gt
-- 
2.34.1