Simplify control item switch statements

Just check the dynamic_cast result to verify check boxes.

Change-Id: I5f370e337e12719eb7ef0dd3512a0f46c76a981e
fdo#72187 Implement KDE4 picker notifications

This notifies the XFilePickerListener of filter changes and file
selection changes.

Change-Id: I749c5f7420f020a3a2fbb764acb5c45d40972cf1
Fix shadowed Test member variable

Change-Id: I2dbb8a643acb21dc023cf8555663083230b93d15