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, 10 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_lattice.c b/source/blender/makesrna/intern/rna_lattice.c
index e7b12206871..3bb00716302 100644
--- a/source/blender/makesrna/intern/rna_lattice.c
+++ b/source/blender/makesrna/intern/rna_lattice.c
@@ -234,6 +234,11 @@ static char *rna_LatticePoint_path(PointerRNA *ptr)
 	return BLI_strdup("");
 }
 
+static int rna_Lattice_is_editmode_get(PointerRNA *ptr)
+{
+	Lattice *lt = (Lattice *)ptr->id.data;
+	return (lt->editlatt != NULL);
+}
 
 #else
 
@@ -350,6 +355,11 @@ static void rna_def_lattice(BlenderRNA *brna)
 	                                  "rna_iterator_array_end", "rna_iterator_array_get", NULL, NULL, NULL, NULL);
 	RNA_def_property_ui_text(prop, "Points", "Points of the lattice");
 
+	prop = RNA_def_property(srna, "is_editmode", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_funcs(prop, "rna_Lattice_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);
 }