[gnome-calendar] enums: Add the GcalTimestampPolicy enum

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 4cf8b51de139a49efbd346a6f54f0bdd6d744e8a
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Tue May 10 14:04:05 2022 +0200

    enums: Add the GcalTimestampPolicy enum
    
    This will be used to control more freely what timestamp is shown on
    event widgets.

 src/gcal-enums.h | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/gcal-enums.h b/src/gcal-enums.h
index 87971ea2..df71a6e5 100644
--- a/src/gcal-enums.h
+++ b/src/gcal-enums.h
@@ -55,3 +55,10 @@ typedef enum
   GCAL_WEEK_DAY_FRIDAY    = 1 << 5,
   GCAL_WEEK_DAY_SATURDAY  = 1 << 6
 } GcalWeekDay;
+
+typedef enum
+{
+  GCAL_TIMESTAMP_POLICY_NONE,
+  GCAL_TIMESTAMP_POLICY_START,
+  GCAL_TIMESTAMP_POLICY_END,
+} GcalTimestampPolicy;