approximately 10 days ago (around Jan 6), my LibreOffice started to show issues when I wanted to open a folder which has special characters in its name. Since the LibreOffice release did not change, I suspect that the issue is in the underlying system, e.g. Plasma. (Hence, the LibreOffice people will claim not to be repsonsible, I suppose.)
LibreOffice seems to use a standard file dialog; when I click on a folder in the tree (like “Entwürfe”), I now get an error dialog “The specified folder does not exist or was not readable”. I can, however, expand the subtree of this folder in the detail view and then access the files in there. Also, I can open a file with Umlaut characters. I just cannot double-click on the “Entwürfe” folder.
The issue does not occur in Dolphin, neither does it occur in file dialogs of Okular (although the latter one really looks similar to the failing dialog in LibreOffice). This would actually be an argument against my hypothesis, but anyway: Who should I ask for help, or who might be interested in a bug report from me on this topic?
Try Tools>Options>General and uncheck Use LibreOffice dialogue boxes in Open/Save dialogue boxes. If that solves the problem, it is a LibreOffice problem.
So your original diagnosis was correct; I have no problems either way with Slav accents but I do not have a folder name containing an Umlaut. Perhaps the issue is confined to the Umlaut. Open a ticket in Bugzilla.
Not only a single umlaut but any non-ascii character. I tried to open the following folders in the file dialog:
~/tmp/ça/
~/tmp/čeština/
~/tmp/déjà/
~/tmp/það/
but I always get the error message that this folder does not exist. As I said, only LibreOffice has this issue.
Using strace, I found the following lines in the trace:
openat(AT_FDCWD, “/home/michael/tmp/?a”, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, “/home/michael/tmp/?e?tina”, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, “/home/michael/tmp/d?j?”, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, “/home/michael/tmp/?a?”, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
What may have changed in Plasma so that the unicode characters are not accepted anymore? Since other programs do not have a problem, I suppose LibreOffice does something wrong what was good before. As said above, LibreOffice did not change in the meantime, as far as I can see (same release number; now it has advanced to 6.4, but the problem was already with the previous release).
This is a Tumbleweed problem. I have replicated it with libreoffice-6.4.0.2-1.2.x86_64 and the previous version (6.4.0.2).
It does not apply to Leap-15.1 or Leap-15.2 alpha.