[Bf-extensions-cvs] [8b32385c] blender2.8: Snap Utilities Line: Fix crash due to difference in the basic size of an object in python in different build solutions.

[mano-wii]

Commit: 8b32385cf00e2fa7280c7ab6c3ac2a3bdf837eb2
Author: mano-wii
Date:   Tue Oct 30 02:11:50 2018 -0300
Branches: blender2.8
https://developer.blender.org/rBA8b32385cf00e2fa7280c7ab6c3ac2a3bdf837eb2

Snap Utilities Line: Fix crash due to difference in the basic size of an object in python in different build solutions.

And add comments

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M	mesh_snap_utilities_line/ops_line.py

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diff --git a/mesh_snap_utilities_line/ops_line.py b/mesh_snap_utilities_line/ops_line.py
index 427b0b30..f8375607 100644
--- a/mesh_snap_utilities_line/ops_line.py
+++ b/mesh_snap_utilities_line/ops_line.py
@@ -43,8 +43,11 @@ def Bpy_Area_header_text_clear(area):
     #HACK
     import ctypes
     func = area.header_text_set
-    c_func = ctypes.c_void_p.from_address(id(func) + 56).value
+    #(int)(&((struct BPy_FunctionRNA *)0)->func) == object.__basicsize__ + 24
+    c_func = ctypes.c_void_p.from_address(id(func) + object.__basicsize__ + 24).value
+    #(int)(&((struct FunctionRNA *)0)->cont.properties.first) == 24
     c_param = ctypes.c_void_p.from_address(c_func + 24).value
+    #(int)(&((struct PropertyRNA *)0)->flag_parameter) == 40
     flag_parameter = ctypes.c_void_p.from_address(c_param + 40)
     previous_value = flag_parameter.value
     flag_parameter.value = 0