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Alexander Mikhaylenko authored
When adding a header bar, ref the header group and connect to 'destroy' signal of the header bar. When a header bar is destroyed or hdy_header_group_remove_header_bar() is called, unref the header bar and remove it from the list. This way, a non-empty header group is only destroyed after every header bar it contains has been removed from the group or destroyed. Fixes #56
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