Bugfix #4609

ESC for OpenGL render (in anim) was hanging, so a 2nd anim render always
returned immediately.

Own bug collection: the SHIFT+NumPad-0 option didn't do an undo-push.

source/blender/src/renderwin.c

@@ -1223,6 +1223,9 @@ void BIF_do_ogl_render(View3D *v3d, int anim)
 	
 	/* open window */
 	renderwin_init_display_cb(rr);
+	if(render_win)
+		render_win->flags &= ~RW_FLAGS_ESCAPE;
+
 	init_gl_stuff();
 	
 	waitcursor(1);

source/blender/src/toets.c

@@ -285,6 +285,7 @@ void persptoetsen(unsigned short event)
 					void setcameratoview3d(void);	// view.c
 					setcameratoview3d();
 					DAG_object_flush_update(G.scene, G.scene->camera, OB_RECALC_OB);
+					BIF_undo_push("View to Camera position");
 					allqueue(REDRAWVIEW3D, 0);
 				}				
 			}