ClangCodeModel: Auto-completion for classes with ui files is broken

Steps to reproduce:

• start Creator with ClangCodeModel plugin, set ClangCodeModel as default code model for C++
• create Qt Widget Application
• inside mainwindow.cpp go to the constructor, after 'ui->setupUI(this);' insert a new line with 'ui'
• hit '.'

Expected behavior:

• '.' should switch to '->' and proposal widget comes up

Current behavior:

• nothing happens

Note: It does not matter if one builds the project right after creation. If you type '->' instead of '.' and hit Ctrl+Space the proposal widget doesn't come up as well.