(set_buffer_internal): Set windows_or_buffers_changed
only if buffer is displayed somewhere. (modify_overlay): Use BUF_COMPUTE_UNCHANGED. (reset_buffer): Set clip_changed to 0 and prevent_redisplay_optimizations_p to 1. (Fget_buffer_create): Set prevent_redisplay_optimizations_p to 1. (modify_overlay): Compute beg/end_unchanged per buffer. (Fget_buffer_create): Initialize new members of the buffer structure.
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