Fix hanful-insert-character (bug#66970)

* lisp/leim/quail/hangul.el (hangul-insert-character): Rework.

1 files changed, 28 insertions, 15 deletions

diff --git a/lisp/leim/quail/hangul.el b/lisp/leim/quail/hangul.el
index 46a2e5a6ba2..f399a20a41c 100644
--- a/lisp/leim/quail/hangul.el
+++ b/lisp/leim/quail/hangul.el
@@ -146,21 +146,34 @@ Setup `quail-overlay' to the last character."
       (progn
         (delete-region (region-beginning) (region-end))
         (deactivate-mark)))
-  (quail-delete-region)
-  (let ((first (car queues)))
-    (insert
-     (hangul-character
-      (+ (aref first 0) (hangul-djamo 'cho (aref first 0) (aref first 1)))
-      (+ (aref first 2) (hangul-djamo 'jung (aref first 2) (aref first 3)))
-      (+ (aref first 4) (hangul-djamo 'jong (aref first 4) (aref first 5))))))
-  (move-overlay quail-overlay (overlay-start quail-overlay) (point))
-  (dolist (queue (cdr queues))
-    (insert
-     (hangul-character
-      (+ (aref queue 0) (hangul-djamo 'cho (aref queue 0) (aref queue 1)))
-      (+ (aref queue 2) (hangul-djamo 'jung (aref queue 2) (aref queue 3)))
-      (+ (aref queue 4) (hangul-djamo 'jong (aref queue 4) (aref queue 5)))))
-    (move-overlay quail-overlay (1+ (overlay-start quail-overlay)) (point))))
+  (let* ((chars-to-insert
+          (with-temp-buffer
+            (dolist (queue queues (mapcar #'identity (buffer-string)))
+              (insert
+               (hangul-character
+                (+ (aref queue 0) (hangul-djamo 'cho (aref queue 0) (aref queue 1)))
+                (+ (aref queue 2) (hangul-djamo 'jung (aref queue 2) (aref queue 3)))
+                (+ (aref queue 4) (hangul-djamo 'jong (aref queue 4) (aref queue 5))))))))
+         (overwrite-maybe
+          (or
+           ;; If the overlay isn't showing (i.e. it has 0 length) then
+           ;; we may want to insert char overwriting (iff overwrite-mode is
+           ;; non-nil, of course)
+           (= (overlay-start quail-overlay) (overlay-end quail-overlay))
+           ;; Likewise we want to do it if there is more then one
+           ;; character that were combined.
+           (cdr chars-to-insert))))
+    (quail-delete-region) ; this empties the overlay
+    (dolist (c chars-to-insert)
+      (let ((last-command-event c)
+            (overwrite-mode (and overwrite-mode
+                                 overwrite-maybe
+                                 overwrite-mode)))
+        (self-insert-command 1)
+        ;; For chars other than fhe first, no more overwrites desired
+        (setq overwrite-maybe nil)))
+    ; this shows the overlay again (TODO: do we really always revive?)
+    (move-overlay quail-overlay (1- (point)) (point))))
 
 (defun hangul-djamo (jamo char1 char2)
   "Return the double Jamo index calculated from the arguments.