fix [#35984] no way to know if a datablock is in editmode

the report explains the issue in detail, but basically you couldn't know if a mesh was in editmode without checking all the objects that use it.
add `is_editmode` readonly property for all datatypes which support editmode.

also make rna fail to build on implicit function declarations.

1 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_mesh.c b/source/blender/makesrna/intern/rna_mesh.c
index 85a669adcc0..3a0e52aa3f2 100644
--- a/source/blender/makesrna/intern/rna_mesh.c
+++ b/source/blender/makesrna/intern/rna_mesh.c
@@ -1556,6 +1556,13 @@ static PointerRNA rna_Mesh_tessface_uv_texture_new(struct Mesh *me, ReportList *
 	return ptr;
 }
 
+
+static int rna_Mesh_is_editmode_get(PointerRNA *ptr)
+{
+	Mesh *me = rna_mesh(ptr);
+	return (me->edit_btmesh != NULL);
+}
+
 /* only to quiet warnings */
 static void UNUSED_FUNCTION(rna_mesh_unused)(void)
 {
@@ -3211,6 +3218,11 @@ static void rna_def_mesh(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Selected Face Total", "Selected face count in editmode");
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
 
+	prop = RNA_def_property(srna, "is_editmode", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_funcs(prop, "rna_Mesh_is_editmode_get", NULL);
+	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+	RNA_def_property_ui_text(prop, "Is Editmode", "True when used in editmode");
+
 	/* pointers */
 	rna_def_animdata_common(srna);
 	rna_def_texmat_common(srna, "rna_Mesh_texspace_editable");