Fix T101803: Max length Operator bl_idname is truncated 1 character.

There were quite a few issues here:
* Bad usage of nagic number leading to confusing code
* Forgetting to take into accoun final `NULL` char
* RNA code thinkin `bl_idname` is python version, when it is actually
  BL/C version.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/makesdna/DNA_windowmanager_types.h b/source/blender/makesdna/DNA_windowmanager_types.h
index d57cca0b055..9b235fac049 100644
--- a/source/blender/makesdna/DNA_windowmanager_types.h
+++ b/source/blender/makesdna/DNA_windowmanager_types.h
@@ -364,7 +364,7 @@ typedef struct wmOperatorTypeMacro {
   struct wmOperatorTypeMacro *next, *prev;
 
   /* operator id */
-  char idname[64];
+  char idname[64]; /* OP_MAX_TYPENAME */
   /* rna pointer to access properties, like keymap */
   /** Operator properties, assigned to ptr->data and can be written to a file. */
   struct IDProperty *properties;
@@ -551,7 +551,7 @@ typedef struct wmOperator {
 
   /* saved */
   /** Used to retrieve type pointer. */
-  char idname[64];
+  char idname[64]; /* OP_MAX_TYPENAME */
   /** Saved, user-settable properties. */
   IDProperty *properties;