TeX-insert-dollar not refusing

[Pieter Pareit]

Develops,

The documentation of TeX-insert-dollar notes that if the current math
mode was not entered with a dollar, it refuses to insert one. At the
moment, it still inserts a dollar. Can this be fixed.

I propose the following:

diff --git a/tex.el b/tex.el
index 95448d8b..e8b9e72c 100644
--- a/tex.el
+++ b/tex.el
@@ -5846,8 +5846,7 @@ sign.  With optional ARG, insert that many dollar
signs."
      (t
       ;; Math mode was not entered with dollar - we cannot finish it
with one.
       (message "Math mode started with `%s' cannot be closed with
dollar"
-              (car texmathp-why))
-      (insert "$"))))
+              (car texmathp-why)))))
    (t
     ;; Just somewhere in the text.
     (cond