macOS: Report preedit cursor position and cursor visibility correctly

Unfortunately QInputMethodEvent::Cursor defines length == 0 as the
cursor being hidden, and length > 0 as being visible. This is the
opposite of what native macOS application do.

A future improvement here would be to base the QInputMethodEvent
logic on QStyle::SH_BlinkCursorWhenTextSelected, which we already
respect for normal selections. That would also allow us to use
QInputMethodEvent::Cursor to set the preedit selection, which
we currently have to fake via QInputMethodEvent::TextFormat.

Change-Id: I75b5d8c5403283a0988355e440a98b4df35ec995
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 9877d55a50db45f7c629f2172dd848ef07e9fabe)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

0 files changed, 0 insertions, 0 deletions