better handle preview close during load

dockes dockes 2007-07-13

changed src/qtgui/preview_w.cpp
changed src/qtgui/preview_w.h
changed src/qtgui/rclmain_w.cpp
src/qtgui/preview_w.cpp 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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src/qtgui/rclmain_w.cpp Diff Switch to side-by-side view
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