Revert "OSX: obey the Qt::WindowTransparentForInput flag"

This reverts commit 79e729e1

, which
partially fixed QTBUG-30122 and will need to be reopened.

On the Creator side, we think using the Qt::ToolTip flag is a bit unsafe
since tooltips are supposed to have very limited interactivity. We would
like to propose to use a similar pattern as in QComboBox instead.

Task-number: QTBUG-30702
Change-Id: I245b7d8b16ac870564ea44f24f481ebfec8ca9a1
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

src/plugins/platforms/cocoa/qcocoawindow.mm

@@ -450,8 +450,6 @@ void QCocoaWindow::setWindowFlags(Qt::WindowFlags flags)
         NSInteger level = this->windowLevel(flags);
         [m_nsWindow setStyleMask:styleMask];
         [m_nsWindow setLevel:level];
-        [m_nsWindow setIgnoresMouseEvents:((flags & Qt::ToolTip) == Qt::ToolTip) ? YES : NO];
-        // TODO deal with WindowTransparentForInput; setIgnoresMouseEvents is too extreme, you can't click the titlebar
         setWindowShadow(flags);
     }