From 18dbd316ef55bed3418bd94407426f18ef1b01a0 Mon Sep 17 00:00:00 2001
From: Craig Jennings <c@cjennings.net>
Date: Sat, 18 Jul 2026 15:50:24 -0500
Subject: feat(music): mark the current playlist row on its number

Emacs draws the filled cursor only in the selected window, and the playlist dock is glanced at from other windows constantly. The pinned cursor was invisible exactly when it was wanted. The current row's number now renders in inverse video, updated as point moves and re-applied after each renumber. The mark shows whether or not the window has focus, and the row band from hl-line was already sticky.
---
 tests/test-music-config--renumber-rows.el | 55 +++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'tests')

diff --git a/tests/test-music-config--renumber-rows.el b/tests/test-music-config--renumber-rows.el
index 449f6d2e..656bbfc9 100644
--- a/tests/test-music-config--renumber-rows.el
+++ b/tests/test-music-config--renumber-rows.el
@@ -83,6 +83,61 @@ can fire after the playlist buffer is gone)."
     (kill-buffer buf)
     (should-not (cj/music--renumber-rows buf))))
 
+;;; Current-row indicator
+
+(ert-deftest test-music-highlight-current-number-marks-current-row ()
+  "Normal: the current row's number renders inverse-video; moving to another
+row restores the old one and marks the new one.  The block cursor only
+draws in the selected window, so the number itself carries the mark."
+  (with-temp-buffer
+    (insert "track one\ntrack two\ntrack three\n")
+    (cj/music--renumber-rows (current-buffer))
+    (goto-char (point-min))
+    (forward-line 1)
+    (cj/music--highlight-current-number)
+    (let ((numbers (test-music-renumber--numbers (current-buffer))))
+      (should-not (plist-get (get-text-property 0 'face (nth 0 numbers)) :inverse-video))
+      (should (plist-get (get-text-property 0 'face (nth 1 numbers)) :inverse-video)))
+    (forward-line 1)
+    (cj/music--highlight-current-number)
+    (let ((numbers (test-music-renumber--numbers (current-buffer))))
+      (should-not (plist-get (get-text-property 0 'face (nth 1 numbers)) :inverse-video))
+      (should (plist-get (get-text-property 0 'face (nth 2 numbers)) :inverse-video)))))
+
+(ert-deftest test-music-highlight-current-number-survives-renumber ()
+  "Boundary: a renumber rebuilds the overlays; the highlight re-applies to
+the current row rather than pointing at a dead overlay."
+  (with-temp-buffer
+    (insert "track one\ntrack two\n")
+    (cj/music--renumber-rows (current-buffer))
+    (goto-char (point-min))
+    (forward-line 1)
+    (cj/music--highlight-current-number)
+    (cj/music--renumber-rows (current-buffer))
+    (let ((numbers (test-music-renumber--numbers (current-buffer))))
+      (should (plist-get (get-text-property 0 'face (nth 1 numbers)) :inverse-video)))))
+
+(ert-deftest test-music-highlight-current-number-keeps-cursor-property ()
+  "Boundary: re-facing a number keeps the cursor property intact."
+  (with-temp-buffer
+    (insert "track one\n")
+    (cj/music--renumber-rows (current-buffer))
+    (goto-char (point-min))
+    (cj/music--highlight-current-number)
+    (let ((s (car (test-music-renumber--numbers (current-buffer)))))
+      (should (get-text-property 0 'cursor s)))))
+
+(ert-deftest test-music-ensure-playlist-buffer-sticky-hl-line ()
+  "Normal: hl-line in the playlist stays visible when the window isn't
+selected -- the dock is glanced at from other windows constantly."
+  (let (created)
+    (cl-letf (((symbol-function 'emms-playlist-mode) #'ignore))
+      (unwind-protect
+          (progn
+            (setq created (cj/music--ensure-playlist-buffer))
+            (should (buffer-local-value 'hl-line-sticky-flag created)))
+        (when (buffer-live-p created) (kill-buffer created))))))
+
 ;;; Hook wiring
 
 (ert-deftest test-music-renumber-ensure-playlist-buffer-wires-hook ()
-- 
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