[elpa] elpa a83c4d0 02/51: Fix compatibility with older Emacs versions

[Tassilo Horn]

branch: elpa
commit a83c4d0e69c12eadd642f13583444fc89badd9f6
Author: Mosè Giordano <address@hidden>
Commit: Mosè Giordano <address@hidden>

    Fix compatibility with older Emacs versions
    
    * tex.el: Dynamic determination of `delete-selection' behavior has been
      introduced in Emacs 24.3.  For previous versions leave
      `TeX-insert-dollar' without that property.
---
 tex.el |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tex.el b/tex.el
index 006af7e..7449659 100644
--- a/tex.el
+++ b/tex.el
@@ -6445,7 +6445,18 @@ NAME may be a package, a command, or a document."
 (put 'TeX-newline 'delete-selection t)
 (put 'TeX-insert-quote 'delete-selection t)
 (put 'TeX-insert-backslash 'delete-selection t)
-(put 'TeX-insert-dollar 'delete-selection (lambda () (null TeX-electric-math)))
+;; When `TeX-electric-math' is non-nil, `TeX-insert-dollar' interferes with
+;; `delete-selection-mode', but when it's nil users may want to be able to
+;; delete active region if `delete-selection-mode' is active, see bug#23177.  
We
+;; can dynamically determine the behavior of `delete-selection' with
+;; `TeX-insert-dollar' based on the value of `TeX-electric-math'.  This
+;; dynamicity has been introduced in Emacs 24.3, for previous versions keep
+;; `TeX-insert-dollar' without this property.
+(if (or (> emacs-major-version 24)
+       (and (= emacs-major-version 24)
+            (>= emacs-minor-version 3)))
+    (put 'TeX-insert-dollar 'delete-selection
+        (lambda () (null TeX-electric-math))))
 
 (defun TeX-how-many (regexp &optional rstart rend)
   "Compatibily function for `how-many'.