[dolphin] [Bug 480111] Deleting a symlink is impossible if the disk of the target is close to full

[Méven Car]

https://bugs.kde.org/show_bug.cgi?id=480111

Méven Car <meven29 at gmail.com> changed:

           What    |Removed                     |Added
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     Ever confirmed|0                           |1
             Status|REPORTED                    |CONFIRMED

--- Comment #4 from Méven Car <meven29 at gmail.com> ---
It seems the size calculation takes into account the symlink destination size
when it should'nt.

It is around this line, we don't check if the file is a symlink.
https://invent.kde.org/frameworks/kio/-/blob/master/src/core/copyjob.cpp#L834

But most importantly we should not resolve the symlink when stat() is called()
when moving the file.
(copy should still copy symlink destinations).
https://invent.kde.org/frameworks/kio/-/blob/master/src/core/copyjob.cpp#L1051

This bug could also affect moving such symlink anywhere on a drive that has
less space than the file it points to' size in some (rare) circumstances, since
`CopyJobPrivate::startRenameJob` does not check file size.

I wonder if we handle properly moving symlinks to trash:/ that would need a
unit-test.

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