Fix bug #7038 with cursor motion in paragraphs w/o strong characters.
xdisp.c (Fcurrent_bidi_paragraph_direction): Call bidi_paragraph_init with NO_DEFAULT_P non-zero. bidi.c (bidi_paragraph_init): Accept an additional argument NO_DEFAULT_P; all callers changed. If NO_DEFAULT_P is non-zero, search back until a paragraph with a strong directional character is found, and use that to determine paragraph's base direction. dispextern.h (bidi_paragraph_init): Update prototype.
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