KEditTagsDialog: Avoid using QDialog::exec

Review Request #108354 - Created Jan. 11, 2013 and submitted

Vishesh Handa
    QDialog::exec runs an event loop at waits for the dialog to be closed.
    Running another event loop is generally not recommended cause it can
    result in *other* events being process which one might not want.
    In this particular case the ResourceLoader, which runs in another
    thread, would emit the finished signal would result in the
    FileMetadataWidget deleting all its previous content, which would
    delete the TagWidget and its children aka the KEditTagsDialog => CRASH
    Instead we now set the windowModality and use QDialog::open, which
    returns immediately and then connect to the finished signal.
    BUG: 281342
Can't seem to crash it.
Commit Hook
Vishesh Handa
Review request changed

Status: Closed (submitted)