Fix bug #15841 with cache-long-scans, linum-mode, and non-ASCII chars.

 src/fileio.c (Finsert_file_contents): Invalidate the newline cache
 for the entire range of inserted characters.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/fileio.c b/src/fileio.c
index d42b3811d76..2c90d2e3c76 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -49,6 +49,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "coding.h"
 #include "window.h"
 #include "blockinput.h"
+#include "region-cache.h"
 #include "frame.h"
 #include "dispextern.h"
 
@@ -4476,6 +4477,14 @@ by calling `format-decode', which see.  */)
       report_file_errno ("Opening input file", orig_filename, save_errno);
     }
 
+  /* We made a lot of deletions and insertions above, so invalidate
+     the newline cache for the entire region of the inserted
+     characters.  */
+  if (current_buffer->newline_cache)
+    invalidate_region_cache (current_buffer,
+                             current_buffer->newline_cache,
+                             PT - BEG, Z - PT - inserted);
+
   if (read_quit)
     Fsignal (Qquit, Qnil);