[FIX] google_calendar: Wrong timezone on cron synchronization

Issue

	- Install "Calendar" app
	- Activate & Set google calendar credidentials
	- Go to user preference
	- Edit and set timezone "Europe/Brussels" e.g.
	- Go to calendar app
	- Add an event and sync with google
	- Go to Settings->Technical->Automation->Scheduled Actions
	- Edit Google Calendar: synchronization
	- Set "Next Execution Date" ASAP

	The timezone on Google Calendar synchronised event is:
	- Before cron: GMT +2
	- After cron: UTC

Cause

	If no timezone is provided in context, it will by default
	use 'UTC' timezone.

Solution

	Like display time on odoo, if no timezone is provided in context,
	it will check the env.user timezone instead.

opw-2228296

closes odoo#51849

X-original-commit: 41372db
Signed-off-by: Nicolas Martinelli (nim) <[email protected]>

Author: nboulif

addons/google_calendar/models/google_calendar.py

@@ -225,12 +225,12 @@ def generate_data(self, event, isCreating=False):
             "start": {
                 type: start_date,
                 vstype: None,
-                'timeZone': self.env.context.get('tz') or 'UTC',
+                'timeZone': self.env.context.get('tz') or self.env.user.tz or 'UTC',
             },
             "end": {
                 type: final_date,
                 vstype: None,
-                'timeZone': self.env.context.get('tz') or 'UTC',
+                'timeZone': self.env.context.get('tz') or self.env.user.tz or 'UTC',
             },
             "attendees": attendee_list,
             "reminders": {