feature/fix-the-long-lines-display-bug 051d2a1e36: Improve isearch in auto-narrow-mode.

[Gregory Heytings]

branch: feature/fix-the-long-lines-display-bug
commit 051d2a1e36a934175b7c487c592126f0aeb7591e
Author: Gregory Heytings <gregory@heytings.org>
Commit: Gregory Heytings <gregory@heytings.org>

    Improve isearch in auto-narrow-mode.
    
    * lisp/isearch.el (isearch-search): Set isearch-lazy-highlight to nil before
    widening in auto-narrow-mode.
    
    * lisp/files.el (auto-narrow--isearch-lazy-highlight): New internal 
variable.
    (auto-narrow-pre-command-function, auto-narrow-post-command-function): Use 
it.
---
 lisp/files.el   | 7 ++++++-
 lisp/isearch.el | 5 ++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/lisp/files.el b/lisp/files.el
index 8d6ecb66bc..89c7334c5a 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -2726,6 +2726,9 @@ beginning and end of the buffer."
 (defvar-local auto-narrow--isearch-widen-automatically nil
   "Internal variable used by `auto-narrow-mode'.")
 
+(defvar-local auto-narrow--isearch-lazy-highlight nil
+  "Internal variable used by `auto-narrow-mode'.")
+
 (defvar-local auto-narrow--initialized nil
   "Internal variable used by `auto-narrow-mode'.")
 
@@ -2733,7 +2736,8 @@ beginning and end of the buffer."
   "Conditionally widen display when `auto-narrow-mode' is in effect."
   (when auto-narrow-mode
     (setq-local widen-automatically t
-                isearch-widen-automatically t)
+                isearch-widen-automatically t
+                isearch-lazy-highlight auto-narrow--isearch-lazy-highlight)
     (if (memq this-command '(narrow-to-region narrow-to-defun narrow-to-page))
         (setq auto-narrow--narrowing-state 'explicit
               widen-automatically auto-narrow--widen-automatically
@@ -2752,6 +2756,7 @@ beginning and end of the buffer."
       (run-hooks 'auto-narrow-hook)
       (setq auto-narrow--widen-automatically widen-automatically
             auto-narrow--isearch-widen-automatically 
isearch-widen-automatically
+            auto-narrow--isearch-lazy-highlight isearch-lazy-highlight
             auto-narrow--narrowing-state 'auto
             auto-narrow--initialized t))
     (let (point cur-point-min buf-point-min buf-point-max size)
diff --git a/lisp/isearch.el b/lisp/isearch.el
index a6e034df6b..29036201ad 100644
--- a/lisp/isearch.el
+++ b/lisp/isearch.el
@@ -3658,7 +3658,10 @@ Optional third argument, if t, means if fail just return 
nil (no error).
                (isearch-search-string isearch-string nil t))
           (if (and (not isearch-success) (buffer-narrowed-p)
                    isearch-widen-automatically widen-automatically)
-              (widen)
+              (progn
+                (when auto-narrow-mode
+                  (setq-local isearch-lazy-highlight nil))
+                (widen))
            ;; Clear RETRY unless the search predicate says
            ;; to skip this search hit.
            (if (or (not isearch-success)