Ignore angle mode while simplifying units

* lisp/calc/calc-forms.el (math-to-hms, math-from-hms):
Ignore value of 'calc-angle-mode' when 'math-simplifying-units'
is non-nil (Bug#23889).
* lisp/calc/calc-math.el (math-to-radians, math-from-radians)
(math-from-radians-2, math-to-radians-2): Idem.

2 files changed, 17 insertions, 7 deletions

diff --git a/lisp/calc/calc-forms.el b/lisp/calc/calc-forms.el
index c94b89d6b10..153b90429ea 100644
--- a/lisp/calc/calc-forms.el
+++ b/lisp/calc/calc-forms.el
@@ -317,7 +317,9 @@
          (list 'calcFunc-hms a))
         ((math-negp a)
          (math-neg (math-to-hms (math-neg a) ang)))
-        ((eq (or ang calc-angle-mode) 'rad)
+        ((eq (or ang
+                 (and (not math-simplifying-units) calc-angle-mode))
+                 'rad)
          (math-to-hms (math-div a (math-pi-over-180)) 'deg))
         ((memq (car-safe a) '(cplx polar)) a)
         (t
@@ -354,12 +356,16 @@
            (if (eq (car-safe a) 'sdev)
                (math-make-sdev (math-from-hms (nth 1 a) ang)
                                (math-from-hms (nth 2 a) ang))
-             (if (eq (or ang calc-angle-mode) 'rad)
+             (if (eq (or ang
+                         (and (not math-simplifying-units) calc-angle-mode))
+                     'rad)
                  (list 'calcFunc-rad a)
                (list 'calcFunc-deg a)))))
         ((math-negp a)
          (math-neg (math-from-hms (math-neg a) ang)))
-        ((eq (or ang calc-angle-mode) 'rad)
+        ((eq (or ang
+                 (and (not math-simplifying-units) calc-angle-mode))
+             'rad)
          (math-mul (math-from-hms a 'deg) (math-pi-over-180)))
         (t
          (math-add (math-div (math-add (math-div (nth 3 a)
diff --git a/lisp/calc/calc-math.el b/lisp/calc/calc-math.el
index 699ef6f49ae..567635eb65b 100644
--- a/lisp/calc/calc-math.el
+++ b/lisp/calc/calc-math.el
@@ -763,12 +763,14 @@ If this can't be done, return NIL."
 (defun math-to-radians (a)   ; [N N]
   (cond ((eq (car-safe a) 'hms)
          (math-from-hms a 'rad))
-        ((memq calc-angle-mode '(deg hms))
+        ((and (not math-simplifying-units)
+              (memq calc-angle-mode '(deg hms)))
          (math-mul a (math-pi-over-180)))
         (t a)))
 
 (defun math-from-radians (a)   ; [N N]
-  (cond ((eq calc-angle-mode 'deg)
+  (cond ((and (not math-simplifying-units)
+              (eq calc-angle-mode 'deg))
          (if (math-constp a)
              (math-div a (math-pi-over-180))
            (list 'calcFunc-deg a)))
@@ -779,14 +781,16 @@ If this can't be done, return NIL."
 (defun math-to-radians-2 (a &optional force-symbolic)   ; [N N]
   (cond ((eq (car-safe a) 'hms)
          (math-from-hms a 'rad))
-        ((memq calc-angle-mode '(deg hms))
+        ((and (not math-simplifying-units)
+              (memq calc-angle-mode '(deg hms)))
          (if (or calc-symbolic-mode force-symbolic)
              (math-div (math-mul a '(var pi var-pi)) 180)
            (math-mul a (math-pi-over-180))))
         (t a)))
 
 (defun math-from-radians-2 (a &optional force-symbolic)   ; [N N]
-  (cond ((memq calc-angle-mode '(deg hms))
+  (cond ((and (not math-simplifying-units)
+              (memq calc-angle-mode '(deg hms)))
          (if (or calc-symbolic-mode force-symbolic)
              (math-div (math-mul 180 a) '(var pi var-pi))
            (math-div a (math-pi-over-180))))