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a/src/qtgui/preview_w.cpp b/src/qtgui/preview_w.cpp
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/* A thread to to the file reading / format conversion */
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/* A thread to to the file reading / format conversion */
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class LoadThread : public QThread {
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class LoadThread : public QThread {
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    int *statusp;
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    int *statusp;
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    Rcl::Doc& out;
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    Rcl::Doc& out;
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    const Rcl::Doc& idoc;
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    const Rcl::Doc& idoc;
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    TempDir tmpdir;
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    int loglevel;
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    int loglevel;
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 public: 
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 public: 
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    string missing;
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    string missing;
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    TempFile imgtmp;
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    TempFile imgtmp;
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    string tdirreason;
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    LoadThread(int *stp, Rcl::Doc& odoc, const Rcl::Doc& idc) 
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    LoadThread(int *stp, Rcl::Doc& odoc, const Rcl::Doc& idc) 
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    : statusp(stp), out(odoc), idoc(idc)
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    : statusp(stp), out(odoc), idoc(idc)
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    {
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    {
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        loglevel = DebugLog::getdbl()->getlevel();
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        loglevel = DebugLog::getdbl()->getlevel();
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    }
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    }
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    ~LoadThread() {
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    ~LoadThread() {
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    }
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    }
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    virtual void run() {
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    virtual void run() {
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    DebugLog::getdbl()->setloglevel(loglevel);
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    DebugLog::getdbl()->setloglevel(loglevel);
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  if (!tmpdir.ok()) {
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      tdirreason = tmpdir.getreason();
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      LOGERR(("Preview: %s\n", tdirreason.c_str()));
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      *statusp = -1;
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      return;
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  }
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  FileInterner interner(idoc, theconfig, tmpdir, 
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  FileInterner interner(idoc, theconfig, FileInterner::FIF_forPreview);
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                              FileInterner::FIF_forPreview);
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    FIMissingStore mst;
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    FIMissingStore mst;
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    interner.setMissingStore(&mst);
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    interner.setMissingStore(&mst);
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    // Even when previewHtml is set, we don't set the interner's
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    // Even when previewHtml is set, we don't set the interner's
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    // target mtype to html because we do want the html filter to
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    // target mtype to html because we do want the html filter to
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    // do its work: we won't use the text/plain, but we want the
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    // do its work: we won't use the text/plain, but we want the
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    if (CancelCheck::instance().cancelState())
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    if (CancelCheck::instance().cancelState())
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    return false;
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    return false;
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    if (status != 0) {
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    if (status != 0) {
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        QString explain;
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        QString explain;
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  if (!lthr.tdirreason.empty()) {
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            explain = tr("Cannot create temporary directory: ") +
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                QString::fromLocal8Bit(lthr.tdirreason.c_str());
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      QMessageBox::critical(0, "Recoll", explain);
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    } else if (!lthr.missing.empty()) {
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    if (!lthr.missing.empty()) {
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            explain = QString::fromAscii("<br>") +
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            explain = QString::fromAscii("<br>") +
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                tr("Missing helper program: ") +
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                tr("Missing helper program: ") +
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                QString::fromLocal8Bit(lthr.missing.c_str());
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                QString::fromLocal8Bit(lthr.missing.c_str());
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        QMessageBox::warning(0, "Recoll",
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        QMessageBox::warning(0, "Recoll",
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                 tr("Can't turn doc into internal "
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                 tr("Can't turn doc into internal "