use v2 scheduler+new timezone handling by default for new users

- In corner cases, enabling the new timezone handling later can cause
reviews to shift forward or back a day, so it's best to have it on
by default.
- https://github.com/ankidroid/Anki-Android/issues/5805 has not landed
in a stable release yet, but will hopefully not be too far off by the
time 2.1.41 is released.
- Existing users will be unaffected, as the upgrade prompt in the previous
commit asks them if they use AnkiDroid.
- Users starting on AnkiDroid will be unaffected, as their collections
will still be on V1.
- The error message AnkiWeb gives when syncing an older AnkiDroid
with the new timezone enabled has been updated to direct users to the
preferences screen.

pylib/tests/test_schedv1.py

@@ -13,6 +13,7 @@ def getEmptyCol():
     col = getEmptyColOrig()
     # only safe in test environment
     col.set_config("schedVer", 1)
+    col._loadScheduler()
     return col
 
 

rslib/src/config.rs

@@ -18,7 +18,7 @@ use slog::warn;
 /// new config variables, you do not need to add them here -
 /// just create an accessor function below with an appropriate
 /// default on missing/invalid values instead.
-pub(crate) fn schema11_config_as_string() -> String {
+pub(crate) fn schema11_config_as_string(creation_offset: Option<i32>) -> String {
     let obj = json!({
         "activeDecks": [1],
         "curDeck": 1,
@@ -33,7 +33,8 @@ pub(crate) fn schema11_config_as_string() -> String {
         "sortBackwards": false,
         "addToCur": true,
         "dayLearnFirst": false,
-        "schedVer": 1,
+        "schedVer": 2,
+        "creationOffset": creation_offset,
     });
     serde_json::to_string(&obj).unwrap()
 }

rslib/src/storage/sqlite.rs

@@ -1,10 +1,10 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-use crate::config::schema11_config_as_string;
 use crate::err::Result;
 use crate::err::{AnkiError, DBErrorKind};
 use crate::timestamp::{TimestampMillis, TimestampSecs};
+use crate::{config::schema11_config_as_string, sched::cutoff::local_minutes_west_for_stamp};
 use crate::{i18n::I18n, sched::cutoff::v1_creation_date, text::without_combining};
 use regex::Regex;
 use rusqlite::{functions::FunctionFlags, params, Connection, NO_PARAMS};
@@ -166,13 +166,18 @@ impl SqliteStorage {
             db.execute_batch(include_str!("schema11.sql"))?;
             // start at schema 11, then upgrade below
             let crt = v1_creation_date();
+            let offset = if server {
+                None
+            } else {
+                Some(local_minutes_west_for_stamp(crt))
+            };
             db.execute(
                 "update col set crt=?, scm=?, ver=?, conf=?",
                 params![
                     crt,
                     TimestampMillis::now(),
                     SCHEMA_STARTING_VERSION,
-                    &schema11_config_as_string()
+                    &schema11_config_as_string(offset)
                 ],
             )?;
         }