Forwarded: part of Origin PR by Jojo-Schmitz
Origin: https://github.com/musescore/MuseScore/pull/9000
Author: François-Xavier Thomas <fxthomas@users.noreply.github.com>
Description: Fix #321716: Fix entering 8th notes in REALTIME MIDI input modes
 When comparing a Fraction (ticks2measureEnd) to the TDuration of the note being entered
 (is.duration()), the Fraction is implicitly converted by the TDuration(const Fraction&) ctor.
 Because of extra logic in TDuration, this can trigger a Q_ASSERT and crash Musescore in case the
 remaining Fraction cannot be exactly converted into a proper TDuration.  In this case, this point is
 reached when ticks2measureEnd = 5/8 and is.duration() = 1/8.
 .
 Since what we really want here is to compare the Fraction to the exact note duration (and not the
 other way around), we can just do an exact comparison between is.duration().fraction() and
 ticks2measureEnd to achieve the same goal.

--- a/libmscore/noteentry.cpp
+++ b/libmscore/noteentry.cpp
@@ -162,7 +162,7 @@ Note* Score::addPitch(NoteVal& nval, boo
             //   We could split the duration at the barline and continue into the next bar, but this would create extra
             //   notes, extra ties, and extra pain. Instead, we simply truncate the duration at the barline.
             Fraction ticks2measureEnd = _is.segment()->measure()->ticks() - _is.segment()->rtick();
-            duration = _is.duration() > ticks2measureEnd ? ticks2measureEnd : _is.duration().fraction();
+            duration = _is.duration().fraction() > ticks2measureEnd ? ticks2measureEnd : _is.duration().fraction();
             }
       else {
             duration = _is.duration().fraction();