GUI preview: make window a dialog so that it closes properly on macos

Jean-Francois Dockes Jean-Francois Dockes 2018-12-02

changed src/qtgui/preview.ui
changed src/qtgui/preview_w.h
src/qtgui/preview.ui Diff Switch to side-by-side view
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src/qtgui/preview_w.h Diff Switch to side-by-side view
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