Fix cursor movement in R2L text within L2R paragraphs.

 src/xdisp.c (set_cursor_from_row): Consider candidate row a win if its
 glyph represents a newline and point is on that newline.  Fixes cursor
 positioning on the newline at EOL of R2L text within L2R
 paragraph, and vice versa.
 (try_cursor_movement): Check continued rows, in addition to
 continuation rows.  Fixes unwarranted scroll when point enters a
 continued line of R2L text within an L2R paragraph, or vice versa.
 (cursor_row_p): Consider the case of point being equal to
 MATRIX_ROW_END_CHARPOS.  Prevents cursor being stuck when moving
 from the end of a short line to the beginning of a continued line
 of R2L text within L2R paragraph.
 (RECORD_MAX_MIN_POS): For max_pos, use IT_CHARPOS even for
 composed characters.

2 files changed, 28 insertions, 6 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index d4d6a4c4bbd..b9c627bf160 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -2,6 +2,19 @@
 
         * xdisp.c (Fcurrent_bidi_paragraph_direction): For unibyte
         buffers, return left-to-right.
+        (set_cursor_from_row): Consider candidate row a win if its glyph
+        represents a newline and point is on that newline.  Fixes cursor
+        positioning on the newline at EOL of R2L text within L2R
+        paragraph, and vice versa.
+        (try_cursor_movement): Check continued rows, in addition to
+        continuation rows.  Fixes unwarranted scroll when point enters a
+        continued line of R2L text within an L2R paragraph, or vice versa.
+        (cursor_row_p): Consider the case of point being equal to
+        MATRIX_ROW_END_CHARPOS.  Prevents cursor being stuck when moving
+        from the end of a short line to the beginning of a continued line
+        of R2L text within L2R paragraph.
+        (RECORD_MAX_MIN_POS): For max_pos, use IT_CHARPOS even for
+        composed characters.
 
         * bidi.c (bidi_check_type): Use xassert.
         (bidi_cache_iterator_state): Update the disp_pos and disp_prop_p
diff --git a/src/xdisp.c b/src/xdisp.c
index 8b3a71027b6..4ed08e72e19 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -13796,7 +13796,14 @@ set_cursor_from_row (struct window *w, struct glyph_row *row,
                           && glyph->charpos != pt_old)))))
         return 0;
       /* If this candidate gives an exact match, use that.  */
-      if (!(BUFFERP (glyph->object) && glyph->charpos == pt_old)
+      if (!((BUFFERP (glyph->object) && glyph->charpos == pt_old)
+            /* If this candidate is a glyph created for the
+               terminating newline of a line, and point is on that
+               newline, it wins because it's an exact match.  */
+            || (!row->continued_p
+                && INTEGERP (glyph->object)
+                && glyph->charpos == 0
+                && pt_old == MATRIX_ROW_END_CHARPOS (row) - 1))
           /* Otherwise, keep the candidate that comes from a row
              spanning less buffer positions.  This may win when one or
              both candidate positions are on glyphs that came from
@@ -14578,7 +14585,8 @@ try_cursor_movement (Lisp_Object window, struct text_pos startp, int *scroll_ste
                     }
                   ++row;
                 }
-              while ((MATRIX_ROW_CONTINUATION_LINE_P (row)
+              while (((MATRIX_ROW_CONTINUATION_LINE_P (row)
+                       || row->continued_p)
                       && MATRIX_ROW_BOTTOM_Y (row) <= last_y)
                      || (MATRIX_ROW_START_CHARPOS (row) == PT
                          && MATRIX_ROW_BOTTOM_Y (row) < last_y));
@@ -18009,7 +18017,8 @@ cursor_row_p (struct glyph_row *row)
 {
   int result = 1;
 
-  if (PT == CHARPOS (row->end.pos))
+  if (PT == CHARPOS (row->end.pos)
+      || PT == MATRIX_ROW_END_CHARPOS (row))
     {
       /* Suppose the row ends on a string.
          Unless the row is continued, that means it ends on a newline
@@ -18404,10 +18413,10 @@ display_line (struct it *it)
           min_pos = current_pos;                                \
           min_bpos = current_bpos;                              \
         }                                                       \
-      if (current_pos > max_pos)                                \
+      if (IT_CHARPOS (*it) > max_pos)                           \
         {                                                       \
-          max_pos = current_pos;                                \
-          max_bpos = current_bpos;                              \
+          max_pos = IT_CHARPOS (*it);                           \
+          max_bpos = IT_BYTEPOS (*it);                          \
         }                                                       \
     }                                                           \
   while (0)