The bug was introduced in commit:
9b7640b8 by Benjamin Otte, 2012-03-26 17:24:02
styleproperty: Make _gtk_style_property_parse_value() return a CssValue
In that commit, `values` changed from `GValue*` to `GtkCssValue**`,
but one `!G_IS_VALUE (&values[8])` was left untouched. As a result,
if `border` shorthand contains anything after color, it might crash,
depending on memory layout.
New test included.
Fixes: #751
I couldn't get all reftests to work reliably, so the tests failing
on either CI or on my machine are skipped for now.
Installed tests are disabled by default and can be enabled with "-Dinstalled_tests=true"
