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Backport !1481 “array: fix corrupt state of GPtrArray after g_ptr_array_extend_and_steal()” to glib-2-64

Philip Withnall requested to merge pwithnall/glib:backport-1481-ptr-array-corruption-fix into glib-2-64

g_ptr_array_extend_and_steal() leaves the GPtrArray in an invalid state, so if you would try to append another pointer, it leads to a crash.

Also adjust the test case so that it would result in the crash (without the fix).

Fixes: 0675703a ('Adding g_ptr_array_extend_and_steal() function to glib/garray.c')

Trivial backport of !1481 (merged) to glib-2-64.

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