(text_read_only): New function.

(verify_interval_modification): Use it instead of signaling
`text-read-only'.  This makes it easier to catch this error
with a breakpoint.:

diff --git a/src/textprop.c b/src/textprop.c
index 03e4b477b357d7264952309616a10d50a8f20025..5342cc2380f6b13cd59dfe6dcb3d81ae30ef8810 100644 (file)
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -75,6 +75,18 @@ Lisp_Object Vtext_property_default_nonsticky;
    to be run later by report_interval_modification.  */
 Lisp_Object interval_insert_behind_hooks;
 Lisp_Object interval_insert_in_front_hooks;
+
+
+/* Signal a `text-read-only' error.  This function makes it easier
+   to capture that error in GDB by putting a breakpoint on it.  */
+
+static void
+text_read_only ()
+{
+  Fsignal (Qtext_read_only, Qnil);
+}
+
+
 \f
 /* Extract the interval at the position pointed to by BEGIN from
    OBJECT, a string or buffer.  Additionally, check that the positions
@@ -1784,7 +1796,7 @@ verify_interval_modification (buf, start, end)
   /* For an insert operation, check the two chars around the position.  */
   if (start == end)
     {
-      INTERVAL prev;
+      INTERVAL prev = NULL;
       Lisp_Object before, after;
 
       /* Set I to the interval containing the char after START,
@@ -1828,7 +1840,7 @@ verify_interval_modification (buf, start, end)
                      if (TMEM (Qread_only, tem)
                          || (NILP (Fplist_get (i->plist, Qread_only))
                              && TMEM (Qcategory, tem)))
-                       Fsignal (Qtext_read_only, Qnil);
+                       text_read_only ();
                    }
                }
 
@@ -1848,7 +1860,7 @@ verify_interval_modification (buf, start, end)
                      if (! TMEM (Qread_only, tem)
                          && (! NILP (Fplist_get (prev->plist,Qread_only))
                              || ! TMEM (Qcategory, tem)))
-                       Fsignal (Qtext_read_only, Qnil);
+                       text_read_only ();
                    }
                }
            }
@@ -1867,13 +1879,13 @@ verify_interval_modification (buf, start, end)
                  if (TMEM (Qread_only, tem)
                      || (NILP (Fplist_get (i->plist, Qread_only))
                          && TMEM (Qcategory, tem)))
-                   Fsignal (Qtext_read_only, Qnil);
+                   text_read_only ();
 
                  tem = textget (prev->plist, Qrear_nonsticky);
                  if (! TMEM (Qread_only, tem)
                      && (! NILP (Fplist_get (prev->plist, Qread_only))
                          || ! TMEM (Qcategory, tem)))
-                   Fsignal (Qtext_read_only, Qnil);
+                   text_read_only ();
                }
            }
        }
@@ -1895,7 +1907,7 @@ verify_interval_modification (buf, start, end)
       do
        {
          if (! INTERVAL_WRITABLE_P (i))
-           Fsignal (Qtext_read_only, Qnil);
+           text_read_only ();
 
          mod_hooks = textget (i->plist, Qmodification_hooks);
          if (! NILP (mod_hooks) && ! EQ (mod_hooks, prev_mod_hooks))