fix: scope cloze fontification to drill buffers via org-drill-mode

org-drill-add-cloze-fontification ran on org-font-lock-set-keywords-hook, which fires in every org buffer, and pushed the cloze rule into org's global org-font-lock-extra-keywords. The cloze regexp is built from the [ and ] delimiters, so an org priority cookie like [#A] matched the cloze pattern and got fontified as a cloze in every org buffer, colliding with org's headline fontification and stripping the heading's org-level-N face.

I replaced the global install with org-drill-mode, a buffer-local minor mode that adds the cloze keywords only to its own buffer via font-lock-add-keywords. org-drill-auto-enable-mode (default on) turns the mode on from org-mode-hook in buffers that hold drill cards, so existing drill files keep their cloze highlighting while plain org buffers stay clean. Highlighting still respects org-drill-use-visible-cloze-face-p.

The cloze regexp itself is unchanged, so the single-line cloze constraint from #38 is preserved.

1 files changed, 7 insertions, 6 deletions

diff --git a/tests/test-org-drill-queue-and-misc.el b/tests/test-org-drill-queue-and-misc.el
index d8cc3fa..81a7844 100644
--- a/tests/test-org-drill-queue-and-misc.el
+++ b/tests/test-org-drill-queue-and-misc.el
@@ -194,26 +194,27 @@ warned-about-id-creation slot flips to t and a fresh ID is returned."
         (org-drill-id-get-create-with-warning session)
         (should (oref session warned-about-id-creation))))))
 
-;;;; org-drill-add-cloze-fontification
+;;;; org-drill-mode (cloze fontification)
 
-(ert-deftest test-org-drill-add-cloze-fontification-sets-buffer-local-regex ()
-  "Sets buffer-local `org-drill-cloze-regexp' built from the current delimiters."
+(ert-deftest test-org-drill-mode-sets-buffer-local-regex ()
+  "Enabling `org-drill-mode' sets buffer-local `org-drill-cloze-regexp' built
+from the current delimiters."
   (with-temp-buffer
     (let ((org-startup-folded nil))
       (org-mode)
       (let ((org-drill-left-cloze-delimiter "{{")
             (org-drill-right-cloze-delimiter "}}"))
-        (org-drill-add-cloze-fontification)
+        (org-drill-mode 1)
         (should (local-variable-p 'org-drill-cloze-regexp))
         ;; The buffer-local regex matches the new delimiters.
         (should (string-match-p org-drill-cloze-regexp "test {{x}} more"))
         (should-not (string-match-p org-drill-cloze-regexp "test [x] more"))))))
 
-(ert-deftest test-org-drill-add-cloze-fontification-sets-buffer-local-keywords ()
+(ert-deftest test-org-drill-mode-sets-buffer-local-keywords ()
   (with-temp-buffer
     (let ((org-startup-folded nil))
       (org-mode)
-      (org-drill-add-cloze-fontification)
+      (org-drill-mode 1)
       (should (local-variable-p 'org-drill-cloze-keywords))
       (should (listp org-drill-cloze-keywords)))))