I'm trying to fix bug I opened some time ago (https://bugs.kde.org/show_bug.cgi?id=411919) and I'm having problem with finding code responsible for saving thumbnail.

After lots of digging through code, kio:src/widgets/previewjob:slotThumbData looks like a place where this would happen, but even when I comment out this block

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    if (save) {
        thumb.setText(QStringLiteral("Thumb::URI"), QString::fromUtf8(origName));
        thumb.setText(QStringLiteral("Thumb::MTime"), QString::number(tOrig.toSecsSinceEpoch()));
        thumb.setText(QStringLiteral("Thumb::Size"), number(currentItem.item.size()));
        thumb.setText(QStringLiteral("Thumb::Mimetype"), currentItem.item.mimetype());
        QString thumbnailerVersion = currentItem.plugin->property(QStringLiteral("ThumbnailerVersion"), QVariant::String).toString();
        QString signature = QLatin1String("KDE Thumbnail Generator ") + currentItem.plugin->name();
        if (!thumbnailerVersion.isEmpty()) {
            signature.append(QLatin1String(" (v") + thumbnailerVersion + QLatin1Char(')'));
        }
        thumb.setText(QStringLiteral("Software"), signature);
         QSaveFile saveFile(thumbPath + thumbName);
         if (saveFile.open(QIODevice::WriteOnly)) {
             if (thumb.save(&saveFile, "PNG")) {
                 saveFile.commit();
             }
         }
    }

completely. Running dolphin still generates thumbnails under ~/.catche/thumbnails
I do see my debug messages though, so it should be fine. Any idea why this would happen?

I've made bit of progress. Commenting this code doesn't stop all previews from generating, but it works for some of them. Namely previews used to show four files inside a directory do appear in thumbnails directory, but regular files don't.

If someone knows this code, pointers still will be appreciated, but finally I'm on a point where I should be able to handle it on my own.