Copy / paste corrupts next measure when the pasted note crosses the barline

Steps:
1- Create a new score with one staff (e.g. flute);
2- In the first beat of the first bar, add a chord with 3 notes, each one a dotted half note;
3- Select the 1/4 rest of first bar and click the eighth note button to change it to two 1/8 rests;
3- Shift-drag to select the chord, copy it, then select the second 1/8 rest in beat 4 and paste it.
4- The score is corrupt at this point, see linked image. The second measure contains 3/4 + 1/8 + 1/4 = 9/8 = 4/4 + 1/8

Image: http://musescore.org/sites/musescore.org/files/issues/corrupted.png

Windows 8.1, commit ae475eb

Notes:
The problem arises because a single note of duration 5/8 (=3/4 - 1/8) does not exist. The note should be splitted in 1/2 + 1/8.
This bug is also present in MuseScore 1.3.

See also: #28461: After copy/paste operation with dotted half note chords and ties, 4/4 bar ends up with only 3 beats in it