gdkwindow-x11: Multiply opaque region rects by the window scale

This fixes rendering issues under HiDPI
Updated slovak translation
GtkListBox: ref_sink new object in set_header and set_adjustment

These are taking ownership of the object in the hierarchy, so should
sink any floating refs to make it easy to use in C code.
Fix a typo in an error message

https://bugzilla.gnome.org/show_bug.cgi?id=707488
Trivial formatting fixes
Visual C++ Builds: Fix "install" Projects

Due to the split up of the property sheets, the install projects did not
have info on the Intermediate and Output Paths, which caused confusing
messages from Visual Studio to show up upon completing build+"install" and
closing Visual Studio on whether to reload the install project, at least on
Visual Studio 2008.

Also clean up the Visual Studio 2008 install project a bit.

Include the property sheet which defines these properties to fix this.
[l10n] Updated Italian translation.
Updated Spanish translation
Updated Polish translation
cellrendererpixbuf: Always follow state

... not just in PRELIT | SELECTED.
cellrendererpixbuf: Follow state even when insensitive
cellrendererpixbuf: Don't eat states

Even when not following states, blacklist the states we don't follow
instead of whitelisting the ones we do. This way, we don't accidentally
eat new ones like the text direction flags.

Fixes a bug where text direction wasn't available when rendering stock
items.

https://bugzilla.gnome.org/show_bug.cgi?id=702423
reftests: Add a reftest for the cell renderer fix

The reftest is a bit flaky because it compares cell renderers with
GtkImage and therefor an icon view with a GtkBox, but it's the best I
can come up with.

https://bugzilla.gnome.org/show_bug.cgi?id=702423
Sync with changes in the cairo device-scale handling

The version of device scale that landed in upstream cairo
master already inherits the device scale in cairo_create_similar,
so no need to do that in gtk anymore.
[gdkcairo] Fix color premultiplication

https://bugzilla.gnome.org/show_bug.cgi?id=513812
Don't call deprecated combobox api

gtk_combo_box_set_title is not needed anymore, since we
dropped the tearoff support.
Don't use deprecated GSimpleActionGroup api

Instead, use the corresponding GActionMap api.
cssimage: Remove unused variables
css: Change currentColor handling

We now pass NULL when the current color should be the default value of
the "color" property and we haven't looked up any value yet. This way we
don't need to look it up all the time and more importantly we can
resolve the default color, which is required because it's a
GtkCssColorValue and not a GtkCssRgbaValue.

Fixes assertions triggering at Polari startup.
reftests: Add test for just fixed Polari crasher