master 5e6393f: Use a square root character in calc displays

[Lars Ingebrigtsen]

branch: master
commit 5e6393fc61a2a2423038fb80288aef30626bdba7
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Use a square root character in calc displays
    
    * lisp/calc/calccomp.el (math-compose-sqrt): Use a square root
    character, if possible (bug#22919).  Suggested by Zephyr Pellerin
    <zephyr.pellerin@gmail.com>.
---
 lisp/calc/calccomp.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/calc/calccomp.el b/lisp/calc/calccomp.el
index 0367c53..1f3ae84 100644
--- a/lisp/calc/calccomp.el
+++ b/lisp/calc/calccomp.el
@@ -1018,7 +1018,8 @@
                    (make-string (+ w 2) ?\_))
            (list 'horiz
                  (if (= h 1)
-                     "V"
+                     (if (char-displayable-p ?√)
+                          "√" "V")
                    (append (list 'vleft (1- a))
                            (make-list (1- h) " |")
                            '("\\|")))