A dialog can be resized for two reasons: the mainItem size changes, or the dialog size changes.
the first can happen programmatically, caused by the Layout, or just by assigning the width.
the second can be caused either programmatically, assigning the size of the dialog or externally by the windowmanager, that is the only one theat in the end has the only final control of the window size
Change-Id: Ifc5c7f683039f83d13a5046c10d6dd0227169542
REVIEW:120235
