add switch in prefs for new timezone handling code; bump sync version

AD devs: before updating the sync version to 10, please make sure
the new timezone code has been ported over. The core change to the
scheduler is in _updateCutoff():

9736e4a970/pylib/anki/schedv2.py (L1357)

with the following supporting Python functions:

9736e4a970/pylib/anki/schedv2.py (L1410)

 _timing_today() is calculated in Rust (lines up to 92, the rest are
tests):

9736e4a970/rslib/src/sched/cutoff.rs (L20)

The change went through a few iterations before stabilising, so it's
probably easier to refer to the above code than the patches that got
us to that point.

pylib/anki/consts.py

@@ -71,7 +71,7 @@ SCHEMA_VERSION = 11
 SYNC_ZIP_SIZE = int(2.5 * 1024 * 1024)
 SYNC_ZIP_COUNT = 25
 SYNC_BASE = "https://sync%s.ankiweb.net/"
-SYNC_VER = 9
+SYNC_VER = 10
 
 HELP_SITE = "https://apps.ankiweb.net/docs/manual.html"
 

qt/aqt/preferences.py

@@ -92,8 +92,10 @@ class Preferences(QDialog):
         f.dayLearnFirst.setChecked(qc.get("dayLearnFirst", False))
         if self.mw.col.schedVer() != 2:
             f.dayLearnFirst.setVisible(False)
+            f.new_timezone.setVisible(False)
         else:
             f.newSched.setChecked(True)
+            f.new_timezone.setChecked(self.mw.col.sched._new_timezone_enabled())
 
     def updateCollection(self):
         f = self.form
@@ -118,6 +120,14 @@ class Preferences(QDialog):
         qc["addToCur"] = not f.useCurrent.currentIndex()
         qc["dayLearnFirst"] = f.dayLearnFirst.isChecked()
         self._updateDayCutoff()
+        if self.mw.col.schedVer() != 1:
+            was_enabled = self.mw.col.sched._new_timezone_enabled()
+            is_enabled = f.new_timezone.isChecked()
+            if was_enabled != is_enabled:
+                if is_enabled:
+                    self.mw.col.sched.set_creation_offset()
+                else:
+                    self.mw.col.sched.clear_creation_offset()
         self._updateSchedVer(f.newSched.isChecked())
         d.setMod()
 

qt/designer/preferences.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>422</width>
-    <height>611</height>
+    <height>636</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -136,6 +136,13 @@
          </property>
         </widget>
        </item>
+       <item>
+        <widget class="QCheckBox" name="new_timezone">
+         <property name="text">
+          <string notr="true">New timezone handling (not yet supported by AnkiDroid)</string>
+         </property>
+        </widget>
+       </item>
        <item>
         <widget class="QComboBox" name="useCurrent">
          <item>
@@ -559,6 +566,7 @@
   <tabstop>nightMode</tabstop>
   <tabstop>dayLearnFirst</tabstop>
   <tabstop>newSched</tabstop>
+  <tabstop>new_timezone</tabstop>
   <tabstop>useCurrent</tabstop>
   <tabstop>newSpread</tabstop>
   <tabstop>uiScale</tabstop>
@@ -571,6 +579,7 @@
   <tabstop>syncOnProgramOpen</tabstop>
   <tabstop>fullSync</tabstop>
   <tabstop>syncDeauth</tabstop>
+  <tabstop>media_log</tabstop>
  </tabstops>
  <resources/>
  <connections>