On Windows, file- and directory-names that end with a space (or a dot)
are invalid, even though it's possible to create them. Same for names
that start with a space (but starting with dots is ok). Even Explorer
chokes when trying to then delete or rename such a file or directory,
and often the only way out of the mess is to operate on the 8.3 path.
In Qt, we only sometimes fixed such paths by removing trailing spaces
and dots. This still made it possible to create a "bad " directory in a
non-native file dialog, which could then not be deleted. The node tree
even ended up with both "bad " and "bad", neither of which was handled
correctly.
Fix this by always chopping trailing space and dots when adding or
modifying a node, amending 3693d3d2a1e76f6e6d41db340505e00c6ddaeda1.
Fortunately, this can be reproduced with QFileSystemModel, so add a test
that exercises it in the same way as QFileDialog does, e.g. both by
creating the misnamed directory directly, and by renaming a directory to
an invalid name.
Given that this is very broken on Windows Explorer as well, don't
cherry-pick this back into branches under strict change management.
Fixes: QTBUG-129028
Change-Id: Iec1edf9fd2548dda4567134a9b5cf3e298589c19
Reviewed-by: Wladimir Leuschner <wladimir.leuschner@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
(cherry picked from commit 53df22b42d73dbb48bc25ad05500993df56b928c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
351b5b3e94