Do not reset original_due when card stays in filtered deck (#2988)

pylib/tests/test_schedv3.py

@@ -657,7 +657,6 @@ def test_filt_reviewing_early_normal():
     # answer 'good'
     col.sched.answerCard(c, 3)
     assert c.due == col.sched.today + c.ivl
-    assert not c.odue
     # should not be in learning
     assert c.queue == QUEUE_TYPE_REV
     # should be logged as a cram rep

rslib/src/scheduler/answering/current.rs

@@ -31,7 +31,6 @@ impl CardStateUpdater {
                 if self.card.original_due != 0 {
                     self.card.original_due
                 } else {
-                    // v2 scheduler resets original_due on first answer
                     self.card.due
                 }
             }

rslib/src/scheduler/answering/mod.rs

@@ -148,7 +148,10 @@ impl CardStateUpdater {
                 match filtered {
                     FilteredState::Preview(next) => self.apply_preview_state(current, next),
                     FilteredState::Rescheduling(next) => {
-                        self.apply_normal_study_state(current, next.original_state)
+                        let revlog = self.apply_normal_study_state(current, next.original_state);
+                        self.card.original_due = self.card.due;
+
+                        revlog
                     }
                 }
             }
@@ -163,7 +166,6 @@ impl CardStateUpdater {
         next: NormalState,
     ) -> RevlogEntryPartial {
         self.card.reps += 1;
-        self.card.original_due = 0;
         self.card.desired_retention = self.desired_retention;
 
         let revlog = match next {

rslib/src/scheduler/filtered/card.rs

@@ -70,7 +70,6 @@ impl Card {
         self.deck_id = self.original_deck_id;
         self.original_deck_id.0 = 0;
 
-        // original_due is cleared if card answered in filtered deck
         if self.original_due != 0 {
             self.due = self.original_due;
         }