clash ui - display "clashes are not loaded" to avoid confusion with "no clashes found"

Example - https://imgur.com/a/5a6cuEG

src/bonsai/bonsai/bim/module/clash/prop.py

@@ -74,6 +74,12 @@ class Clash(PropertyGroup):
         status: bool
 
 
+def clashes_loaded_update(self: "ClashSet", context: bpy.types.Context) -> None:
+    if self.clashes_loaded:
+        return
+    tool.Clash.clear_active_clash_set_results()
+
+
 class ClashSet(PropertyGroup):
     mode: EnumProperty(
         items=[
@@ -96,6 +102,11 @@ class ClashSet(PropertyGroup):
     a: CollectionProperty(name="Group A", type=ClashSource)
     b: CollectionProperty(name="Group B", type=ClashSource)
     clashes: CollectionProperty(name="Clashes", type=Clash)
+    clashes_loaded: BoolProperty(
+        name="Clash Results Are Loaded",
+        description="Click to unload clash results for the clash set.",
+        update=clashes_loaded_update,
+    )
 
     if TYPE_CHECKING:
         mode: Literal["intersection", "collision", "clearance"]
@@ -106,6 +117,7 @@ class ClashSet(PropertyGroup):
         a: bpy.types.bpy_prop_collection_idprop[ClashSource]
         b: bpy.types.bpy_prop_collection_idprop[ClashSource]
         clashes: bpy.types.bpy_prop_collection_idprop[Clash]
+        clashes_loaded: bool
 
     def get_clash_sources_group(
         self, group: tool.Clash.ClashSourceGroup

src/bonsai/bonsai/bim/module/clash/ui.py

@@ -145,11 +145,18 @@ class BIM_PT_ifcclash(Panel):
         op.filepath = props.export_path
 
         row = layout.row()
-        row.label(text=f"{len(clash_set.clashes)} Clashes Found", icon="PIVOT_CURSOR")
+        if clash_set.clashes_loaded:
+            row.column().label(text=f"{len(clash_set.clashes)} Clashes Found", icon="PIVOT_CURSOR")
 
-        layout.template_list("BIM_UL_clashes", "", props.active_clash_set, "clashes", props, "active_clash_index")
-        row = layout.row()
-        row.operator("bim.select_clash")
+            col = row.column()
+            col.alignment = "RIGHT"
+            col.prop(clash_set, "clashes_loaded", text="", icon="TRASH", invert_checkbox=True)
+
+            layout.template_list("BIM_UL_clashes", "", props.active_clash_set, "clashes", props, "active_clash_index")
+            row = layout.row()
+            row.operator("bim.select_clash")
+        else:
+            row.label(text="Clashes Are Not Loaded", icon="PIVOT_CURSOR")
 
 
 class BIM_PT_clash_manager(Panel):

src/bonsai/bonsai/tool/clash.py

@@ -109,6 +109,17 @@ class Clash(bonsai.core.tool.Clash):
             blender_clash.a_name = "{}/{}".format(clash["a_ifc_class"], clash["a_name"])
             blender_clash.b_name = "{}/{}".format(clash["b_ifc_class"], clash["b_name"])
             blender_clash.status = False if not "status" in clash else clash["status"]
+        clash_set.clashes_loaded = True
+
+    @classmethod
+    def clear_active_clash_set_results(cls) -> None:
+        props = cls.get_clash_props()
+        clash_set = props.active_clash_set
+        if not clash_set:
+            return
+        clash_set.clashes.clear()
+        if "clashes_loaded" in clash_set:
+            del clash_set["clashes_loaded"]
 
     @classmethod
     def load_clash_sets(cls, fn: str) -> None: