feat: allow fetching block bounds not including children.

core/block_svg.ts

@@ -109,6 +109,14 @@ export class BlockSvg
    */
   width = 0;
 
+  /**
+   * Width of this block, not including any connected value blocks.
+   * Width is in workspace units.
+   *
+   * @internal
+   */
+  childlessWidth = 0;
+
   /**
    * Map from IDs for warnings text to PIDs of functions to apply them.
    * Used to be able to maintain multiple warnings.
@@ -436,8 +444,28 @@ export class BlockSvg
    * @returns Object with coordinates of the bounding box.
    */
   getBoundingRectangle(): Rect {
+    return this.getBoundingRectangleWithDimensions(this.getHeightWidth());
+  }
+
+  /**
+   * Returns the coordinates of a bounding box describing the dimensions of this
+   * block alone.
+   * Coordinate system: workspace coordinates.
+   *
+   * @returns Object with coordinates of the bounding box.
+   */
+  getBoundingRectangleWithoutChildren(): Rect {
+    return this.getBoundingRectangleWithDimensions({
+      height: this.height,
+      width: this.width,
+    });
+  }
+
+  private getBoundingRectangleWithDimensions(blockBounds: {
+    height: number;
+    width: number;
+  }) {
     const blockXY = this.getRelativeToSurfaceXY();
-    const blockBounds = this.getHeightWidth();
     let left;
     let right;
     if (this.RTL) {

core/renderers/common/drawer.ts

@@ -80,6 +80,7 @@ export class Drawer {
     // The dark path adds to the size of the block in both X and Y.
     this.block_.height = this.info_.height;
     this.block_.width = this.info_.widthWithChildren;
+    this.block_.childlessWidth = this.info_.width;
   }
 
   /** Create the outline of the block.  This is a single continuous path. */