diff --git a/README.md b/README.md
index dc97923e..9a3be8c2 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ npm run build        # writes dist/ and regenerates index.html; the folder is wh
 The browser suite and the three example games need a machine with a GPU:
 
 ```bash
-node tools/seed-e2e.mjs && node tools/e2e.mjs      # the editor, 1209 checks (GM_STEPS=20 for one step)
+node tools/seed-e2e.mjs && node tools/e2e.mjs      # the editor, 1210 checks (GM_STEPS=20 for one step)
                                                    #   every tool signs in first – see the Accounts page
 node tools/seed-jumprun.mjs && node tools/smoke-jumprun.mjs
 node tools/seed-tetris.mjs && node tools/smoke-tetris.mjs
diff --git a/src/editor/shader/ShaderEditor.ts b/src/editor/shader/ShaderEditor.ts
index e2465177..3edadabe 100644
--- a/src/editor/shader/ShaderEditor.ts
+++ b/src/editor/shader/ShaderEditor.ts
@@ -185,8 +185,10 @@ export class ShaderEditor extends AssetTabEditor<ShaderAsset, GraphCanvas> {
       for (const row of this.params.removeChildren()) row.destroy({ children: true });
       this.sliders.clear();
       for (const def of defs) this.params.add(this.paramRow(def));
-      // The column keeps its size, so a resize would not reach the rows: the column lays out anew.
+      // Neither the column nor, with as many rows as before, the stack of rows changes its size,
+      // and a resize that changes nothing lays nothing out: both lay out anew, outside in.
       this.side.relayout();
+      this.params.relayout();
     }
     for (const def of defs) {
       const row = this.sliders.get(def.key);
diff --git a/tools/e2e/28-shader.mjs b/tools/e2e/28-shader.mjs
index 494bf340..fc761270 100644
--- a/tools/e2e/28-shader.mjs
+++ b/tools/e2e/28-shader.mjs
@@ -809,6 +809,21 @@ export async function shader(t) {
       written.declared === 1,
     { pulled, dark, written },
   );
+  // A changed range rebuilds the row while the column keeps its height: the new slider still gets
+  // its width, and its right end is the new max.
+  await mutate(`
+    __gm.state.project.assets.find((a) => a.id === ${JSON.stringify(made.id)})
+      .graph.nodes.find((n) => n.id === 'level').params.max = 2;`);
+  await sleep(300);
+  const widened = await json("__gm.shader.sliderAt('level')");
+  await click(widened.x + widened.w - 2, widened.y + widened.h / 2);
+  await sleep(300);
+  const pushed = await json('__gm.shader.preview()');
+  check(
+    'a new max rebuilds the slider at full width, and its right end is the new max',
+    widened.w > 40 && Math.abs(widened.w - levelSlider.w) < 1 && pushed.values.level === 2,
+    { levelSlider, widened, pushed },
+  );
 
   await assetProps({ texture: picture?.id ?? '', color: 0xffffff, shader: made.id, level: 0.5 });
   const onSprite = await openPreview({