[Emacs-diffs] master f591765: Fix bidi paragraph direction when inserting text at newline

[Eli Zaretskii]

branch: master
commit f591765e2b6b9ec3fa3ff647c77a10c984f78133
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>

    Fix bidi paragraph direction when inserting text at newline
    
    * src/insdel.c (invalidate_buffer_caches): Invalidate the bidi
    paragraph cache when inserting immediately after a newline.
    (Bug#26083)
---
 src/insdel.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/insdel.c b/src/insdel.c
index e4ad9a2..0a2e07a 100644
--- a/src/insdel.c
+++ b/src/insdel.c
@@ -2001,18 +2001,21 @@ invalidate_buffer_caches (struct buffer *buf, ptrdiff_t 
start, ptrdiff_t end)
      see below).  */
   if (buf->bidi_paragraph_cache)
     {
-      if (start != end
-         && start > BUF_BEG (buf))
+      if (start > BUF_BEG (buf))
        {
          /* If we are deleting or replacing characters, we could
             create a paragraph start, because all of the characters
             from START to the beginning of START's line are
             whitespace.  Therefore, we must extend the region to be
-            invalidated up to the newline before START.  */
+            invalidated up to the newline before START.  Similarly,
+            if we are inserting characters immediately after a
+            newline, we could create a paragraph start if the
+            inserted characters start with a newline.  */
          ptrdiff_t line_beg = start;
          ptrdiff_t start_byte = buf_charpos_to_bytepos (buf, start);
+         int prev_char = BUF_FETCH_BYTE (buf, start_byte - 1);
 
-         if (BUF_FETCH_BYTE (buf, start_byte - 1) != '\n')
+         if ((start == end) == (prev_char == '\n'))
            {
              struct buffer *old = current_buffer;