diff options
| author | Eli Zaretskii <eliz@gnu.org> | 2016-09-05 19:57:22 +0300 |
|---|---|---|
| committer | Eli Zaretskii <eliz@gnu.org> | 2016-09-05 19:57:22 +0300 |
| commit | 6acff25280dbb97b5e9ddfd872b33ceb36b0470a (patch) | |
| tree | 24b7152457c11d14aefdf8952ce7d3500586be05 /src | |
| parent | cfaf18a27c262694750400005e882f1cfc7ff2b0 (diff) | |
Avoid assertion violations when scrolling narrowed buffer
* src/window.c (window_scroll_pixel_based):
* src/xdisp.c (pos_visible_p): Don't allow simulated redisplay to
start outside the accessible portion of the buffer. This avoids
assertion violations when some Lisp narrows the buffer to less
than the current window, and then attempts to scroll the buffer.
Diffstat (limited to 'src')
| -rw-r--r-- | src/window.c | 5 | ||||
| -rw-r--r-- | src/xdisp.c | 5 |
2 files changed, 6 insertions, 4 deletions
diff --git a/src/window.c b/src/window.c index 374ef0f838..753ebc16fb 100644 --- a/src/window.c +++ b/src/window.c @@ -4813,8 +4813,9 @@ window_scroll_pixel_based (Lisp_Object window, int n, bool whole, bool noerror) SET_TEXT_POS_FROM_MARKER (start, w->start); /* Scrolling a minibuffer window via scroll bar when the echo area shows long text sometimes resets the minibuffer contents behind - our backs. */ - if (CHARPOS (start) > ZV) + our backs. Also, someone might narrow-to-region and immediately + call a scroll function. */ + if (CHARPOS (start) > ZV || CHARPOS (start) < BEGV) SET_TEXT_POS (start, BEGV, BEGV_BYTE); /* If PT is not visible in WINDOW, move back one half of diff --git a/src/xdisp.c b/src/xdisp.c index dc68cd48e5..d1e884820b 100644 --- a/src/xdisp.c +++ b/src/xdisp.c @@ -1317,8 +1317,9 @@ pos_visible_p (struct window *w, ptrdiff_t charpos, int *x, int *y, SET_TEXT_POS_FROM_MARKER (top, w->start); /* Scrolling a minibuffer window via scroll bar when the echo area shows long text sometimes resets the minibuffer contents behind - our backs. */ - if (CHARPOS (top) > ZV) + our backs. Also, someone might narrow-to-region and immediately + call a scroll function. */ + if (CHARPOS (top) > ZV || CHARPOS (top) < BEGV) SET_TEXT_POS (top, BEGV, BEGV_BYTE); /* If the top of the window is after CHARPOS, the latter is surely |