fixed rubbing out <:Xq>, <:^Uq> and other append-to-register operations

* This was a regression introduced in 41ab5cf0289dab60ac1ddc97cf9680ee2468ea6c,
  which changed the semantics of teco_doc_undo_set_string().
* Removed undo_append_string() Q-Reg virtual method.
  append_string() now does its own undo token emission, so that we can
  defer the teco_doc_undo_edit() after the point that the document
  was initialized. This is important, so that we can configure the
  default encoding on new registers.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/qreg.h b/src/qreg.h
index f5866e7..59cf2cc 100644
--- a/src/qreg.h
+++ b/src/qreg.h
@@ -52,8 +52,9 @@ typedef const struct {
 	gboolean (*set_string)(teco_qreg_t *qreg, const gchar *str, gsize len,
 	                       guint codepage, GError **error);
 	gboolean (*undo_set_string)(teco_qreg_t *qreg, GError **error);
+
+	/* does not need an explicit undo-call */
 	gboolean (*append_string)(teco_qreg_t *qreg, const gchar *str, gsize len, GError **error);
-	gboolean (*undo_append_string)(teco_qreg_t *qreg, GError **error);
 
 	gboolean (*get_string)(teco_qreg_t *qreg, gchar **str, gsize *len,
 	                       guint *codepage, GError **error);