Jonas Dreßler
959c3286d0
When placing new partitions and there's space left because the new partitions aren't occupying the whole free space, context_grow_partitions_on_free_area() is supposed to distribute the free space between the new partitions. If still no partition wants the free space, the free space ends up becoming padding. Currently that padding is allocated to the partition preceding the FreeArea (ie. a->after). This obviously means that the new partitions now end up at the *end* of the free area rather than at the beginning, which is somewhat unexpected given how partition placement usually is done. Fix it by finding the last partition that belongs to the free area, and then allocating the padding to that partition, so that the new partitions end up getting aligned with the beginning of the free area, not the end. Because the span might not be rounded to grain if there's a pre-allocated a->after partition before the free area, we need to round it down ourselves (otherwise the "left >= p->new_padding" assertion in context_place_partitions() is going to fail). Also ensure the fix works as expected by adding a test.
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