Fix QUrl::fromLocalFile with long path prefix

After commit 3966b571 the function was kinda broken already, though
this got unnoticed since it was not covered by an the auto-test.
This commit adds another test case with Windows native separators
and removes the use of QDir::fromNativeSeparators. Instead use the
original code from QDir::fromNativeSeparators to replace the backslashes.

Change-Id: I190560d0e75cb8c177d63b142aa4be5b01498da2
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 06689a2d7a18882535819ed13ac7248c81330529)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

0 files changed, 0 insertions, 0 deletions