Fixed dragging corners

BEdit/README.md

@@ -115,7 +115,8 @@ BEdit document used as a copy source. The built-in example defines A, B, and C.
   clicks, use right-angle segments, and snap to the graph snapping grid.
   Right-click cancels an unfinished connection.
 - Select a routed connection to reveal its draggable nodes. Right-click a line
-  to add a node, or right-click a node to delete it.
+  to add a node, or right-click a node to delete it. Angled routes persist every
+  orthogonal corner as a draggable, grid-snapped node.
 - Use **Box**, **Line**, and **Text** to add persistent graph annotations. Lines
   share the Direct, Angled, and Spline routing controls. Annotation context menus
   provide the same shape styling as the icon editor and can move annotations
@@ -129,7 +130,8 @@ BEdit document used as a copy source. The built-in example defines A, B, and C.
   icon shape, icon text, fill color, and border color. The same dialog can hide
   that component's contained subtree from the Libraries tree.
 - The icon editor uses Pointer and click-drag drawing tools. Its toolbar and
-  mouse wheel provide zoom in, zoom out, and fit-to-canvas controls.
+  mouse wheel provide zoom in, zoom out, and fit-to-canvas controls. Selected
+  rectangles expose draggable corner and edge resize handles in both editors.
 - Double-click a text component to edit its input list, output list, and
   `implementation.source` JSON.
 - Right-click any graph component under Current Document to add nested graph or