Fix crash with invisible text and overlays (Bug#7016).

* src/dispextern.h (struct it): New member overlay_strings_charpos.

* src/xdisp.c (next_overlay_string, load_overlay_strings): Record the
charpos where we computed n_overlay_strings.
(next_overlay_string): Load overlay strings at recorded position,
which may not be the same as the iterator's charpos (Bug#7016).

1 files changed, 2 insertions, 2 deletions

diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index ff04b76bf82..3f5660e82cb 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -4290,7 +4290,7 @@ With prefix argument N moves forward N messages with these labels.
 
 ;;;***
 
-;;;### (autoloads (rmail-mime) "rmailmm" "rmailmm.el" "4a7502b4aeb3bd5f2111b48cc6512924")
+;;;### (autoloads (rmail-mime) "rmailmm" "rmailmm.el" "222ca7c1e672a08e5799e5a72fb25049")
 ;;; Generated autoloads from rmailmm.el
 
 (autoload 'rmail-mime "rmailmm" "\
@@ -4381,7 +4381,7 @@ If prefix argument REVERSE is non-nil, sorts in reverse order.
 
 ;;;### (autoloads (rmail-summary-by-senders rmail-summary-by-topic
 ;;;;;;  rmail-summary-by-regexp rmail-summary-by-recipients rmail-summary-by-labels
-;;;;;;  rmail-summary) "rmailsum" "rmailsum.el" "26b95919c7e1f8c5609ce7323aee77ae")
+;;;;;;  rmail-summary) "rmailsum" "rmailsum.el" "d855683972baef7111d4508dffbb54b6")
 ;;; Generated autoloads from rmailsum.el
 
 (autoload 'rmail-summary "rmailsum" "\