Given a dir A that has some files and a subdir B, when a model is set to
only show files, setting the root path to A, the filters are initially
respected. Setting the root path to B then back to A, the filters would
be ignored and B would be visible in the model.
Traversing the path elements in node() led to dir B getting added to
the bypassFilters hash table, which made filtersAcceptNode() bypass the
filters.
I couldn't find a commit explaining the logic behind using bypassFilters
(the trail goes cold at the 'Qt 4.5' mega commit). The only clue I found
was the "// always accept drives" comment in the code, which hints at
this being useful only on Windows(?).
Fixes: QTBUG-74471
Pick-to: 6.7 6.6 6.5
Change-Id: Icb9055524a28990c591e924634a63e29a49835aa
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
83e5d74864