Don't show a copy of the property's name in the inspector's tooltip if there's no description

(cherry picked from commit 28d3f85e64493de58ddd4f83a72545ff6fa617a6)

editor/connections_dialog.cpp

@@ -500,7 +500,6 @@ Control *ConnectionsDockTree::make_custom_tooltip(const String &p_text) const {
 	String text = TTR("Signal:") + " [u][b]" + p_text.get_slice("::", 0) + "[/b][/u]";
 	text += p_text.get_slice("::", 1).strip_edges() + "\n";
 	text += p_text.get_slice("::", 2).strip_edges();
-	help_bit->set_text(text);
 	help_bit->call_deferred("set_text", text); //hack so it uses proper theme once inside scene
 	return help_bit;
 }

editor/editor_inspector.cpp

@@ -778,10 +778,20 @@ Control *EditorProperty::make_custom_tooltip(const String &p_text) const {
 	help_bit->add_style_override("panel", get_stylebox("panel", "TooltipPanel"));
 	help_bit->get_rich_text()->set_fixed_size_to_width(360 * EDSCALE);
 
-	String text = TTR("Property:") + " [u][b]" + p_text.get_slice("::", 0) + "[/b][/u]\n";
-	text += p_text.get_slice("::", 1).strip_edges();
-	help_bit->set_text(text);
-	help_bit->call_deferred("set_text", text); //hack so it uses proper theme once inside scene
+	Vector<String> slices = p_text.split("::", false);
+	if (!slices.empty()) {
+		String property_name = slices[0].strip_edges();
+		String text = TTR("Property:") + " [u][b]" + property_name + "[/b][/u]";
+
+		if (slices.size() > 1) {
+			String property_doc = slices[1].strip_edges();
+			if (property_name != property_doc) {
+				text += "\n" + property_doc;
+			}
+		}
+		help_bit->call_deferred("set_text", text); //hack so it uses proper theme once inside scene
+	}
+
 	return help_bit;
 }
 
@@ -1005,10 +1015,20 @@ Control *EditorInspectorCategory::make_custom_tooltip(const String &p_text) cons
 	help_bit->add_style_override("panel", get_stylebox("panel", "TooltipPanel"));
 	help_bit->get_rich_text()->set_fixed_size_to_width(360 * EDSCALE);
 
-	String text = "[u][b]" + p_text.get_slice("::", 0) + "[/b][/u]\n";
-	text += p_text.get_slice("::", 1).strip_edges();
-	help_bit->set_text(text);
-	help_bit->call_deferred("set_text", text); //hack so it uses proper theme once inside scene
+	Vector<String> slices = p_text.split("::", false);
+	if (!slices.empty()) {
+		String property_name = slices[0].strip_edges();
+		String text = "[u][b]" + property_name + "[/b][/u]";
+
+		if (slices.size() > 1) {
+			String property_doc = slices[1].strip_edges();
+			if (property_name != property_doc) {
+				text += "\n" + property_doc;
+			}
+		}
+		help_bit->call_deferred("set_text", text); //hack so it uses proper theme once inside scene
+	}
+
 	return help_bit;
 }