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win32: fix expander rendering for horizontal GtkToolItemGroups
Expanders are usually drawn as little triangles and unfortunately do not support rotated drawing modes. So a hack is applied (see gtk_tool_item_group_header_expose_event_cb for details) when drawing a GtkToolItemGroup's header for horizontal GtkToolShells, forcing the triangle to point in the right direction. Except we don't draw expanders as triangles on Windows. Usually, expanders are represented as "+" and "-". It sucks for "+" to become "-" and the inverse when we don't want to, so reverse the hack here.
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