[gnome-maps/wip/mlundblad/fix-transit-calender-month-one-off] transitOptionsPanel: Fix one-off error when setting date

[Marcus Lundblad <mlundblad src gnome org>]

commit d36d943be37e86a0eb8f647869fb8665de485b69
Author: Marcus Lundblad <ml dfupdate se>
Date:   Mon May 2 22:13:11 2022 +0200

    transitOptionsPanel: Fix one-off error when setting date
    
    When setting the GtkCalendar date when clicking the date
    button when using "Leave By" or "Arrive By" we need to
    subtact one to the month value, as the select_month()
    method expects 0-based months.

 src/transitOptionsPanel.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/transitOptionsPanel.js b/src/transitOptionsPanel.js
index cdadc84c..70e1a57e 100644
--- a/src/transitOptionsPanel.js
+++ b/src/transitOptionsPanel.js
@@ -138,7 +138,7 @@ var TransitOptionsPanel = GObject.registerClass({
     _updateTransitDateButton(date) {
         let calendar = this._transitDateButton.popover.get_child();
 
-        calendar.select_month(date.get_month(), date.get_year());
+        calendar.select_month(date.get_month() - 1, date.get_year());
         calendar.select_day(date.get_day_of_month());
         this._transitDateButton.label =
             /*