* lisp/isearch.el (lazy-highlight-buffer): New defcustom. (Bug#29360)

(lazy-highlight-buffer-max-at-a-time): New defcustom.
(isearch-lazy-highlight-buffer): New defvar.
(isearch-lazy-highlight-new-loop): Don't check changes in window
boundaries when lazy-highlight-buffer is non-nil.
Move code that extends start/end to match whole string at point
here from isearch-lazy-highlight-search.
(isearch-lazy-highlight-search): Add args string and bound
like in other search functions.  Move calculation of bound
to isearch-lazy-highlight-update.
(isearch-lazy-highlight-match): New function with code extracted from
isearch-lazy-highlight-update to be called also from
isearch-lazy-highlight-buffer-update.
(isearch-lazy-highlight-update): Reuse the values returned from
window-group-start and window-group-end.  At the end schedule the
timer to call isearch-lazy-highlight-buffer-update when
isearch-lazy-highlight-buffer is non-nil.
(isearch-lazy-highlight-buffer-update): New function.

1 files changed, 8 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index be32ac6b9bb..57a83068bd2 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -581,6 +581,14 @@ can now be searched via 'C-s'.
 
 ** Search and Replace
 
+*** lazy-highlight-buffer highlights matches in the full buffer.
+It is useful in combination with lazy-highlight-cleanup customized to nil
+to leave matches highlighted in the whole buffer after exiting isearch.
+Also when lazy-highlight-buffer prepares highlighting in the buffer,
+navigation through the matches without flickering is more smooth.
+lazy-highlight-buffer-max-at-a-time controls the number of matches to
+highlight in one iteration while processing the full buffer.
+
 +++
 *** New isearch bindings.