Squish: Fix tst_basic_cpp_support

Replace waiting for signal textChanged().

Change-Id: I40feb7d49310d4aa9fae4ca4256e9ce2d0f2ab4d
Reviewed-by: Robert Loehning <robert.loehning@digia.com>
Squish: No QML debugging with Qt 4.7

Task-number: QTCREATORBUG-10528
Change-Id: I41eab9bc179cb00b489dbc7576dd36c6377569a6
Reviewed-by: Christian Stenger <christian.stenger@digia.com>