causality inference done

BEdit/src/bedit/gui/graphics/connection_styles.py

@@ -27,7 +27,7 @@ class ConnectionStyle:
 # This is the intentional code-level styling point for every port/connection type.
 CONNECTION_STYLES: dict[str, ConnectionStyle] = {
     "signal": ConnectionStyle(),
-    "power": ConnectionStyle(width=3.0, arrow_style="half", color="#000000"),
+    "power": ConnectionStyle(width=3.0, arrow_style="half", color="#000000", arrow_size=20.0),
 }
 
 

BEdit/src/bedit/gui/graphics/workspace.py

@@ -397,6 +397,19 @@ class ConnectionGraphicsItem(QGraphicsPathItem):
         self.name_label: NameLabelItem | None = None
         self.sync_name_label(connection)
 
+    def boundingRect(self) -> QRectF:  # noqa: N802
+        """Include custom arrowheads and causality marks in Qt's repaint area."""
+
+        decoration_margin = (
+            max(self.style.arrow_size, 6.0) + self.style.selected_width / 2 + 1.0
+        )
+        return super().boundingRect().adjusted(
+            -decoration_margin,
+            -decoration_margin,
+            decoration_margin,
+            decoration_margin,
+        )
+
     def sync_name_label(self, connection: Connection) -> None:
         visible = bool(connection.properties.get("showName", False))
         if not visible: