Cleanup: get rid of last G.main's in bpy area.

Essentially 'validating' them as G_MAIN, and adding some asserts in
dubious places, that handled IDs are actually in G_MAIN.

source/blender/python/bmesh/bmesh_py_types.c

@@ -38,6 +38,7 @@
 #include "BKE_customdata.h"
 #include "BKE_DerivedMesh.h"
 #include "BKE_global.h"
+#include "BKE_library.h"
 
 #include "bmesh.h"
 
@@ -905,8 +906,9 @@ static PyObject *bpy_bmesh_to_mesh(BPy_BMesh *self, PyObject *args)
 	/* python won't ensure matching uv/mtex */
 	BM_mesh_cd_validate(bm);
 
+	BLI_assert(BKE_id_is_in_gobal_main(&me->id));
 	BM_mesh_bm_to_me(
-	        G.main,  /* XXX UGLY! */
+	        G_MAIN,  /* XXX UGLY! */
 	        bm, me,
 	        (&(struct BMeshToMeshParams){
 	            .calc_object_remap = true,

source/blender/python/generic/bpy_internal_import.c

@@ -185,7 +185,7 @@ PyObject *bpy_text_import_name(const char *name, int *found)
 	Text *text;
 	char txtname[MAX_ID_NAME - 2];
 	int namelen = strlen(name);
-//XXX	Main *maggie = bpy_import_main ? bpy_import_main:G.main;
+//XXX	Main *maggie = bpy_import_main ? bpy_import_main : G_MAIN;
 	Main *maggie = bpy_import_main;
 
 	*found = 0;
@@ -234,7 +234,7 @@ PyObject *bpy_text_reimport(PyObject *module, int *found)
 	Text *text;
 	const char *name;
 	const char *filepath;
-//XXX	Main *maggie = bpy_import_main ? bpy_import_main:G.main;
+//XXX	Main *maggie = bpy_import_main ? bpy_import_main : G_MAIN;
 	Main *maggie = bpy_import_main;
 
 	if (!maggie) {

source/blender/python/generic/bpy_internal_import.h

@@ -51,7 +51,7 @@ PyObject   *bpy_text_reimport(PyObject *module, int *found);
 
 void bpy_text_filename_get(char *fn, size_t fn_len, struct Text *text);
 
-/* The game engine has its own Main struct, if this is set search this rather than G.main */
+/* The game engine has its own Main struct, if this is set search this rather than G_MAIN */
 struct Main *bpy_import_main_get(void);
 void bpy_import_main_set(struct Main *maggie);
 

source/blender/python/intern/bpy.c

@@ -34,7 +34,7 @@
 #include "BLI_string.h"
 
 #include "BKE_appdir.h"
-#include "BKE_global.h" /* XXX, G.main only */
+#include "BKE_global.h" /* XXX, G_MAIN only */
 #include "BKE_blender_version.h"
 #include "BKE_bpath.h"
 
@@ -136,7 +136,7 @@ static PyObject *bpy_blend_paths(PyObject *UNUSED(self), PyObject *args, PyObjec
 
 	list = PyList_New(0);
 
-	BKE_bpath_traverse_main(G.main, bpy_blend_paths_visit_cb, flag, (void *)list);
+	BKE_bpath_traverse_main(G_MAIN, bpy_blend_paths_visit_cb, flag, (void *)list);
 
 	return list;
 }

source/blender/python/intern/bpy_library_write.c

@@ -95,7 +95,7 @@ static PyObject *bpy_lib_write(PyObject *UNUSED(self), PyObject *args, PyObject
 		return NULL;
 	}
 
-	Main *bmain_src = G.main;
+	Main *bmain_src = G_MAIN;
 	int write_flags = 0;
 
 	if (use_relative_remap) {

source/blender/python/intern/bpy_rna.c

@@ -7017,7 +7017,7 @@ PyObject *BPY_rna_module(void)
 	PointerRNA ptr;
 
 	/* for now, return the base RNA type rather than a real module */
-	RNA_main_pointer_create(G.main, &ptr);
+	RNA_main_pointer_create(G_MAIN, &ptr);
 	pyrna = (BPy_StructRNA *)pyrna_struct_CreatePyObject(&ptr);
 
 	rna_module_ptr = &pyrna->ptr;
@@ -7028,9 +7028,9 @@ void BPY_update_rna_module(void)
 {
 	if (rna_module_ptr) {
 #if 0
-		RNA_main_pointer_create(G.main, rna_module_ptr);
+		RNA_main_pointer_create(G_MAIN, rna_module_ptr);
 #else
-		rna_module_ptr->data = G.main; /* just set data is enough */
+		rna_module_ptr->data = G_MAIN; /* just set data is enough */
 #endif
 	}
 }

source/blender/python/intern/bpy_rna_anim.c

@@ -45,6 +45,7 @@
 #include "BKE_fcurve.h"
 #include "BKE_global.h"
 #include "BKE_idcode.h"
+#include "BKE_library.h"
 #include "BKE_report.h"
 
 #include "RNA_access.h"
@@ -266,12 +267,14 @@ PyObject *pyrna_struct_keyframe_insert(BPy_StructRNA *self, PyObject *args, PyOb
 		return PyBool_FromLong(result);
 	}
 	else {
+		ID *id = self->ptr.id.data;
 		ReportList reports;
 		short result;
 
 		BKE_reports_init(&reports, RPT_STORE);
 
-		result = insert_keyframe(G.main, &reports, (ID *)self->ptr.id.data, NULL, group_name, path_full, index, cfra, keytype, options);
+		BLI_assert(BKE_id_is_in_gobal_main(id));
+		result = insert_keyframe(G_MAIN, &reports, id, NULL, group_name, path_full, index, cfra, keytype, options);
 		MEM_freeN((void *)path_full);
 
 		if (BPy_reports_to_error(&reports, PyExc_RuntimeError, true) == -1)

source/blender/python/intern/bpy_rna_id_collection.c

@@ -160,7 +160,7 @@ static PyObject *bpy_user_map(PyObject *UNUSED(self), PyObject *args, PyObject *
 	BPy_StructRNA *pyrna = (BPy_StructRNA *)self;
 	Main *bmain = pyrna->ptr.data;
 #else
-	Main *bmain = G.main;  /* XXX Ugly, but should work! */
+	Main *bmain = G_MAIN;  /* XXX Ugly, but should work! */
 #endif
 
 	PyObject *subset = NULL;
@@ -230,7 +230,6 @@ static PyObject *bpy_user_map(PyObject *UNUSED(self), PyObject *args, PyObject *
 	lb_index = set_listbasepointers(bmain, lb_array);
 
 	while (lb_index--) {
-
 		if (val_types_bitmap && lb_array[lb_index]->first) {
 			if (!id_check_type(lb_array[lb_index]->first, val_types_bitmap)) {
 				continue;

source/blender/python/intern/gpu_offscreen.c

@@ -36,6 +36,7 @@
 #include "WM_types.h"
 
 #include "BKE_global.h"
+#include "BKE_library.h"
 
 #include "ED_screen.h"
 
@@ -169,7 +170,7 @@ static PyObject *pygpu_offscreen_draw_view3d(BPy_GPUOffScreen *self, PyObject *a
 	MatrixObject *py_mat_modelview, *py_mat_projection;
 	PyObject *py_scene, *py_region, *py_view3d;
 
-	struct Main *bmain = G.main;  /* XXX UGLY! */
+	struct Main *bmain = G_MAIN;  /* XXX UGLY! */
 	Scene *scene;
 	View3D *v3d;
 	ARegion *ar;
@@ -191,6 +192,8 @@ static PyObject *pygpu_offscreen_draw_view3d(BPy_GPUOffScreen *self, PyObject *a
 		return NULL;
 	}
 
+	BLI_assert(BKE_id_is_in_gobal_main(&scene->id));
+
 	fx = GPU_fx_compositor_create();
 
 	fx_settings = v3d->fx_settings;  /* full copy */