Fix for invalid pointers within a copied line set.

Now the line set buffer is cleared when a new .blend file is opened, so
that a line set may not be copied and pasted between two .blend files.

source/blender/freestyle/FRS_freestyle.h

@@ -52,6 +52,7 @@ extern "C" {
 	// Rendering
 	void FRS_initialize(void);
 	void FRS_set_context(bContext* C);
+	void FRS_read_file(bContext* C);
 	int FRS_is_freestyle_enabled(struct SceneRenderLayer* srl);
 	void FRS_init_stroke_rendering(struct Render* re);
 	struct Render* FRS_do_stroke_rendering(struct Render* re, struct SceneRenderLayer* srl);

source/blender/freestyle/intern/blender_interface/FRS_freestyle.cpp

@@ -82,6 +82,10 @@ extern "C" {
 		controller->setContext(C);
 	}
 
+	void FRS_read_file(bContext* C) {
+		lineset_copied = false;
+	}
+
 	void FRS_exit() {
 		delete pathconfig;
 		delete controller;

source/blender/windowmanager/CMakeLists.txt

@@ -31,6 +31,7 @@ set(INC
 	../blenloader
 	../editors/include
 	../gpu
+	../freestyle
 	../imbuf
 	../makesdna
 	../makesrna

source/blender/windowmanager/intern/wm_files.c

@@ -111,6 +111,8 @@
 #include "BPY_extern.h"
 #endif
 
+#include "FRS_freestyle.h"
+
 #include "WM_api.h"
 #include "WM_types.h"
 #include "wm.h"
@@ -414,6 +416,7 @@ void WM_read_file(bContext *C, const char *filepath, ReportList *reports)
 		BPY_app_handlers_reset(FALSE);
 		BPY_modules_load_user(C);
 #endif
+		FRS_read_file(C);
 
 		/* important to do before NULL'ing the context */
 		BLI_exec_cb(CTX_data_main(C), NULL, BLI_CB_EVT_LOAD_POST);