I can consider krusader as a good tool for synchronization. At least, since Dolphin has turned down my RfE for a simple 'Synch' feature.

However, I don't get it to do what I desire. (Let's for the purpose of description say left->right synchronization.)
To me, synchronization implies keeping two folders with identical content. That is, copy everything from left to right that doesn't exist there, or with an older date, or with a different contents. Plus, delete everything on the right hand side that doesn't exist (any longer) on the left hand side.
And the latter part is where I don't seem to manage krusader. Or is it a bug?
I'll attach two screenshots as explanation. The difference are two files, on the right (target) side that don't exist on the left. They are shown only, when I activate 'right-to-left' in the Options. But they don't show when I ask for the list of items to be deleted.

My mistake, or a bug?

[Alas, whenever I attach an image file (some 30 kB only) it times out. I tried thrice. What to do??]