XCB: Commit 260bfaf... in qtbase breaks "Left" key in qt creator (Neo keyboard layout)

When using qtcreator:
In the Neo layout: http://www.neo-layout.org/, a "left" keypress is generated when pressing "Alt Gr" + "s" or "<>/" + "s". This worked fine for the older qtcreator.

Since commit 260bfaf056c08330ec2ed292e8d9def550e662ec in qtbase.git, however, pressing "Alt Gr" + "s" does nothing in the editor window. When keeping "Alt Gr" pressed, and pressing "s" a second time, then it works. For the "<>/" + "s" combination it still works as expected.

Not sure if this is a qtcreator bug or a qt bug, so I filed both. The other bug can be found here: QTCREATORBUG-9820