master c734ba6: Fix Indian time zone test when run by Irishmen (bug#45818)

[Mattias Engdegård]

branch: master
commit c734ba68623279d814e857ddc536421a08c38f34
Author: Mattias Engdegård <mattiase@acm.org>
Commit: Mattias Engdegård <mattiase@acm.org>

    Fix Indian time zone test when run by Irishmen (bug#45818)
    
    * test/lisp/calendar/solar-tests.el (solar-sunrise-sunset):
    Inhibit any attempt by confused calendar code to apply daylight saving
    correction when Irish time zone settings are in effect.  It's not
    entirely clear why this is needed but may be related to the fact that
    'IST' stands for both Irish and Indian Standard Time, and that Ireland
    uses reversed daylight saving in winter.
---
 test/lisp/calendar/solar-tests.el | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/lisp/calendar/solar-tests.el 
b/test/lisp/calendar/solar-tests.el
index 7a37f8d..337deb8 100644
--- a/test/lisp/calendar/solar-tests.el
+++ b/test/lisp/calendar/solar-tests.el
@@ -26,7 +26,9 @@
         (calendar-longitude 75.8)
         (calendar-time-zone +330)
         (calendar-standard-time-zone-name "IST")
-        (calendar-daylight-time-zone-name "IST")
+        ;; Make sure our clockwork isn't confused by daylight saving rules
+        ;; in effect for any other time zone (bug#45818).
+        (calendar-daylight-savings-starts nil)
         (epsilon (/ 60.0)))             ; Minute accuracy is good enough.
     (let* ((sunrise-sunset (solar-sunrise-sunset '(12 30 2020)))
            (sunrise (car (nth 0 sunrise-sunset)))