Cocoa: Support pasting rich text to Qt apps

Native Mac OS X apps uses Rtf as the rich text format
while Qt uses html. Add QMacPasteboardMimeRtfText
which supports converting from public.rtf to text/html
(but not the other way around, since we want to keep
posting our html as html).

The QMacInternalPasteboardMime API does not support
the concept of a one-way handler. Skip the Rtf handler
in QMacPasteboard::setMimeData().

Task-number: QTBUG-37188
Change-Id: Ibe29997a038bbb64da24b961e84a5f60133074e0
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Compile: isChildOfQMdiSubWindow may be unused.

[-Werror,-Wunused-function]

Change-Id: Icf1e60ce3c5dadb96272453583d1cd03379eb73b
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Cocoa: Make QScreen::topLevelAt() work correctly

The QPlatformScreen::topLevelAt() default implementation
is flawed in that it does not check z-ordering but
simply returns the first window in the window list
that contains the test point.

Add QCocoaScreen::topLevelAt(). Use [NSApp orderedWindows]
to iterate through the window list in z order. Add
a NSWindow->QCococaWindow mapping hash to QCocoaIntegration
for getting the corresponding QWindow once a NSWindow
is found.

Task-number: QTBUG-37597
Change-Id: I7af70163a32528cb56f8d6caa037b98f580ee191
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Cocoa: Make backing store flush accurate.

Flush the individual rects that make up the region
instead of the bounding rect. This is required for
correctness since then areas not included in the
region might not have valid backing store content.

The bondingRect() usage here had its roots in an
optimization in Qt 4, where it was observed that
flushing the bounding rect was more efficient than
flushing (many) individual rects.

Task-number: QTBUG-37918
Change-Id: Ib805f6713523f9895be24c48466870efaaf89c02
Reviewed-by: Liang Qi <liang.qi@digia.com>
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Cocoa: Don't beep on maximize.

Use zoom instead of performZoom: Does not beep if
there is no Zoom button, and is what Qt 4 did.

Task-number: QTBUG-37716
Change-Id: Iaa85d55a449744c38b260cf79745a433e0e3272f
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
OS X: Improve QLibraryInfo app bundle testing.

QLibraryInfo::location() paths are relative to
"myapp.app/Contents/" when the application has a
bundle and relative to the executable when not.

However CFBundleGetMainBundle() can and will return
a valid CFBundleRef even if the application is built
as a standalone executable.

Add a test that verifies that the path constructed
with "/Contents" exists on disk. Fall back to the
non-bundle code path if it doesn't.

This bug was hit in cases where a qt.conf file was
present side-by-side with the app binary, for example
in qtbase/bin.

Task-number: QTBUG-38039
Change-Id: Id993599208fe94fff283c725778f8ad47b610ba7
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Improve QWidget::metric for PdmDevicePixelRatio.

Use QWindow::devicePixelRatio() which is the most
accurate devicePixelRatio accessor since it can ask
the platform native window directly

Fall back to qApp->devicePixelRatio() if the window
pointer is not valid.

Task-number: QTBUG-37606
Task-number: QTBUG-38078
Change-Id: Ief1468a0c6ced07439f55329ab056883016241cc
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>