[Bf-blender-cvs] [5f86489] blender-v2.75-release: Partial fix T45156: scaling region crash

[Campbell Barton]

Commit: 5f864894a4aef274b2962319ed1248a75849ff83
Author: Campbell Barton
Date:   Mon Jun 29 16:44:18 2015 +1000
Branches: blender-v2.75-release
https://developer.blender.org/rB5f864894a4aef274b2962319ed1248a75849ff83

Partial fix T45156: scaling region crash

'ar->winy' may not be initialized, making regions zoom in (past limits)
and attempt to draw very large text (~10x10k size characters), often crashing.

Fix isn't complete since it only corrects factory startup.

===================================================================

M	source/blender/blenloader/intern/versioning_defaults.c

===================================================================

diff --git a/source/blender/blenloader/intern/versioning_defaults.c b/source/blender/blenloader/intern/versioning_defaults.c
index 045f422..0e8e6e9 100644
--- a/source/blender/blenloader/intern/versioning_defaults.c
+++ b/source/blender/blenloader/intern/versioning_defaults.c
@@ -127,8 +127,9 @@ void BLO_update_defaults_startup_blend(Main *bmain)
 
 					/* simple fix for 3d view properties scrollbar being not set to top */
 					if (ar->regiontype == RGN_TYPE_UI) {
-						ar->v2d.cur.ymax = ar->v2d.tot.ymax;
-						ar->v2d.cur.ymin = ar->v2d.cur.ymax - ar->winy;
+						float offset = ar->v2d.tot.ymax - ar->v2d.cur.ymax;
+						ar->v2d.cur.ymax += offset;
+						ar->v2d.cur.ymin += offset;
 					}
 				}
 			}