Pasting note on multi-voice upstem note causes crash

Confirmed in R5275 (Windows). Crashes badly so the Qt Debugger doesn't catch it
NOT FOUND: 01
NOT FOUND: 02

You don't need to create the situation from scratch, you can use the enclosed score.

Just try to copy the note from bar 1 onto the one in bar 2.

Investigation:

While in Score::cmdPaste we receive debug "ChordRest::add: unknown element Note".

Stepping out back into ScoreView::normalPaste() we get a crash in Score::endCmd(), which calls Score::end2().

In there the crash happens in Score::doLayout() somewhere after this block of code:
layoutStage1(); // compute note head lines and accidentals
layoutStage2(); // beam notes, finally decide if chord is up/down
layoutStage3(); // compute note head horizontal positions
layoutSystems(); // create list of systems
layoutPages(); // create list of pages

Debug console shows:
ASSERT: "!isEmpty()" in file C:/QtSDK/Desktop/Qt/4.7.4/mingw/include/QtCore/qlist.h, line 272

From qlist.h we see:
272: const T& last() const { Q_ASSERT(!isEmpty()); return at(count() - 1); }

So someone calls last() on an empty list. To be continued.

Further investigation:

With a message handler installed one can catch the crash easily.

It comes from Chord::layoutStem() in chord.cpp.
Note* upnote = upNote();
Note* downnote = downNote();
The notes array is empty, so QList<*Note>::last aborts on a Q_ASSERT.

Automatically closed -- issue fixed for 2 weeks with no activity.