Nyall Dawson cb178a7bb8 New class QgsWindowManagerInterface
With implementation in app. This allows GUI library classes to
re-use standard dialogs which are created in app. The initial
use-case is to allow the GUI library symbol list widget to
focus/open an existing Style Manager dialog (created in app),
instead of opening a new modal style manager dialog.

Side benefit - moves some code out of the monolithic qgisapp.cpp
file.
2018-09-14 21:13:10 +10:00
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2018-09-14 21:13:10 +10:00
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