implement cancellation in preview loading

dockes dockes 2006-01-27

changed src/qtgui/preview/preview.ui
changed src/qtgui/preview/preview.ui.h
changed src/qtgui/plaintorich.cpp
changed src/qtgui/plaintorich.h
changed src/qtgui/rclmain.cpp
src/qtgui/preview/preview.ui Diff Switch to side-by-side view
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src/qtgui/preview/preview.ui.h Diff Switch to side-by-side view
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src/qtgui/plaintorich.cpp Diff Switch to side-by-side view
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src/qtgui/plaintorich.h Diff Switch to side-by-side view
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src/qtgui/rclmain.cpp Diff Switch to side-by-side view
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