(verify_interval_modification): Don't just test

Qread_only prop; use INTERVAL_WRITABLE_P.

1 files changed, 6 insertions, 5 deletions

diff --git a/src/intervals.c b/src/intervals.c
index a737e9dceef..3d30e21c3ee 100644
--- a/src/intervals.c
+++ b/src/intervals.c
@@ -1479,21 +1479,22 @@ verify_interval_modification (buf, start, end)
 
       if (NULL_INTERVAL_P (prev))
         {
-          after = textget (i->plist, Qread_only);
-          if (! NILP (after))
+          if (! INTERVAL_WRITABLE_P (i))
             error ("Attempt to insert within read-only text");
         }
       else if (NULL_INTERVAL_P (i))
         {
-          before = textget (prev->plist, Qread_only);
-          if (! NILP (before))
+          if (! INTERVAL_WRITABLE_P (prev))
             error ("Attempt to insert within read-only text");
         }
       else
         {
           before = textget (prev->plist, Qread_only);
           after = textget (i->plist, Qread_only);
-          if (! NILP (before) && EQ (before, after))
+          if (! NILP (before) && EQ (before, after)
+              /* This checks Vinhibit_read_only properly
+                 for the common value of the read-only property.  */
+              && ! INTERVAL_WRITABLE_P (i))
             error ("Attempt to insert within read-only text");
         }