Switch to unified view

a/src/qtgui/preview_w.cpp b/src/qtgui/preview_w.cpp
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            out.mimetype = "text/html";
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            out.mimetype = "text/html";
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        }
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        }
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        imgtmp = interner.get_imgtmp();
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        imgtmp = interner.get_imgtmp();
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        } else {
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        } else {
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        out.mimetype = interner.getMimetype();
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        out.mimetype = interner.getMimetype();
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        interner.getMissingExternal(&mst, missing);
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        mst.getMissingExternal(missing);
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        *statusp = -1;
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        *statusp = -1;
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        }
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        }
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    } catch (CancelExcept) {
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    } catch (CancelExcept) {
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        *statusp = -1;
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        *statusp = -1;
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    }
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    }