Re: address@hidden: Possible mouse-face redisplay glitch]

[Chong Yidong]

Richard Stallman <address@hidden> writes:

> First generate a calendar in the lower window with:
>
> M-x calendar RET
>
> Put mouse over Jan 3 entry such that its mouse-face text property is active
> and:
>
> <
>
> For me, the position under the mouse (ie, the non-entry above Dec 6 entry)
> still appears highlighted in mouse-face.  A C-l clears the highlighting.

This bug was introduced by the following change:

2006-10-06  Kim F. Storm  <address@hidden>

        * xdisp.c (pos_visible_p): Fix value when EOB is visible.

*** emacs/src/xdisp.c   2006/10/01 16:44:43     1.1123
--- emacs/src/xdisp.c   2006/10/06 13:30:45     1.1124
***************
*** 1346,1352 ****
        it2 = it;
        if (IT_CHARPOS (it) < ZV && FETCH_BYTE (IT_BYTEPOS (it)) != '\n')
        move_it_by_lines (&it, 1, 0);
!       if (charpos < IT_CHARPOS (it))
        {
          visible_p = 1;
          move_it_to (&it2, charpos, -1, -1, -1, MOVE_TO_POS);
--- 1346,1353 ----
        it2 = it;
        if (IT_CHARPOS (it) < ZV && FETCH_BYTE (IT_BYTEPOS (it)) != '\n')
        move_it_by_lines (&it, 1, 0);
!       if (charpos < IT_CHARPOS (it)
!         || (it.what == IT_EOB && charpos == IT_CHARPOS (it)))
        {
          visible_p = 1;
          move_it_to (&it2, charpos, -1, -1, -1, MOVE_TO_POS);

Kim, do you remember what the rationale for this change was, and can
you think of why this is causing the problem?