Staff texts for all staves displayed on first staff

Context: Commit: ea0cfccba (2014-03-27), self-compiled under Linux Mint 14, Qt lib 5.1.0, Qt Creator 2.7.2

Steps:
1) Open or create a score with more than one staff
2) Add a staff text to a staff other than the first

Result: the staff text is displayed on the first staff, whatever staff it belongs to, both during editing and in normal display mode.

Expected result: the staff text should be displayed on the staff it has been attached to.

Note:: Even if there is no crash nor data loss or corruption, the issue has been marked critical as it may severely disrupt the comprehensibility, usability and editability of the score; in other words, I think it to be higher priority than simply normal.