Blender Git Loki

WM_operator_props_popup was calling ED_undo_push_op() which is also called by wm_operator_finished.
This made new image operator and seperate image sequence call ED_undo_push_op() twice.
Tested with move to layer and python select pattern operators and it works ok.

including backtraces for the double calls just incase.

# first
#2 0x00000000009ff4c4 in ED_undo_push_op (C=0x20e1098, op=0x3ea13a8) at /media/data/blender_ideasman42/blender_trunk/source/blender/editors/util/undo.c:187
#3 0x00000000008b5fa1 in WM_operator_props_popup (C=0x20e1098, op=0x3ea13a8, event=0x3ea0d28) at /media/data/blender_ideasman42/blender_trunk/source/blender/windowmanager/intern/wm_operators.c:1032
#4 0x00000000008be6be in wm_operator_invoke (C=0x20e1098, ot=0x2408bd8, event=0x3ea0d28, properties=0x3e943d8, reports=0x0) at /media/data/blender_ideasman42/blender_trunk/source/blender/windowmanager/intern/wm_event_system.c:613
#5 0x00000000008bfa44 in wm_handler_operator_call (C=0x20e1098, handlers=0x25509a0, handler=0x25cb658, event=0x3ea0d28, properties=0x3e943d8) at /media/data/blender_ideasman42/blender_trunk/source/blender/windowmanager/intern/wm_event_system.c:1158

# second
#2 0x00000000009ff4c4 in ED_undo_push_op (C=0x20e1098, op=0x3ea13a8) at /media/data/blender_ideasman42/blender_trunk/source/blender/editors/util/undo.c:187
#3 0x00000000008bde8e in wm_operator_finished (C=0x20e1098, op=0x3ea13a8, repeat=0) at /media/data/blender_ideasman42/blender_trunk/source/blender/windowmanager/intern/wm_event_system.c:439
#4 0x00000000008be82a in wm_operator_invoke (C=0x20e1098, ot=0x2408bd8, event=0x3ea0d28, properties=0x3e943d8, reports=0x0) at /media/data/blender_ideasman42/blender_trunk/source/blender/windowmanager/intern/wm_event_system.c:640
#5 0x00000000008bfa44 in wm_handler_operator_call (C=0x20e1098, handlers=0x25509a0, handler=0x25cb658, event=0x3ea0d28, properties=0x3e943d8) at /media/data/blender_ideasman42/blender_trunk/source/blender/windowmanager/intern/wm_event_system.c:1158