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Paul Eggert authored
* buffer.h (overlays_at, sort_overlays, GET_OVERLAYS_AT): * editfns.c (overlays_around, get_pos_property): * textprop.c (get_char_property_and_overlay): * xdisp.c (next_overlay_change, note_mouse_highlight): * xfaces.c (face_at_buffer_position): * buffer.c (overlays_at, sort_overlays, Foverlays_at) (Fnext_overlay_change, Fprevious_overlay_change): Use ptrdiff_t, not int, for sizes. (overlays_at): Check for size-calculation overflow.
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