fix(music): show the cursor on the row number and open the dock taller

With point pinned at the row start, redisplay drew the cursor after the number's before-string, on the album-art thumbnail, where a block cursor is invisible. A cursor property on the number string makes redisplay draw it on the number.

The dock also kept reopening too short: its height memory remembered whatever size the window had at toggle-off, including squeezes from window churn. The squeezed fraction then overrode the default on every later open. The default rises to a third of the frame, and the toggle discards captured heights below it (a deliberate enlargement still sticks for the session).

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/test-music-config--renumber-rows.el b/tests/test-music-config--renumber-rows.el
index 8abe1704..449f6d2e 100644
--- a/tests/test-music-config--renumber-rows.el
+++ b/tests/test-music-config--renumber-rows.el
@@ -47,6 +47,16 @@
     (cj/music--renumber-rows (current-buffer))
     (should (= 2 (length (test-music-renumber--numbers (current-buffer)))))))
 
+(ert-deftest test-music-renumber-rows-number-carries-cursor-property ()
+  "Normal: the number string carries a cursor property.  Point is pinned at
+the row start, and without the property redisplay draws the cursor after
+the before-string -- on the album-art thumbnail, where it's invisible."
+  (with-temp-buffer
+    (insert "track one\n")
+    (cj/music--renumber-rows (current-buffer))
+    (let ((s (car (test-music-renumber--numbers (current-buffer)))))
+      (should (get-text-property 0 'cursor s)))))
+
 ;;; Boundary Cases
 
 (ert-deftest test-music-renumber-rows-skips-blank-lines ()