fix(studio): restore stroke color, radius unlink, and mask inset in flat Style

.fallowrc.jsonc

@@ -337,6 +337,16 @@
       "file": "packages/studio/src/components/editor/propertyPanelSections.tsx",
       "exports": ["TextAreaField"],
     },
+    // Link: its only consumer was FlatRadiusRow's uniform-only fallback row in
+    // propertyPanelFlatStyleSections.tsx, deleted by the Style parity fix
+    // (p8-task-style-parity) — that row was unreachable from a uniform radius
+    // and is now replaced by BorderRadiusEditor's own unlink toggle. Kept in
+    // the icon set for future reuse rather than deleted from a file outside
+    // this fix's scope.
+    {
+      "file": "packages/studio/src/icons/SystemIcons.tsx",
+      "exports": ["Link"],
+    },
   ],
   "ignoreDependencies": [
     // Runtime/dynamic deps not visible to static analysis: tsup `external`,

packages/studio/src/components/editor/propertyPanelFlatStyleHelpers.ts

@@ -1,3 +1,18 @@
+// Mirrors legacy `propertyPanelStyleSections.tsx`'s `SelectField` "Style" options —
+// the single source of truth for which border-style tokens are valid.
+export const STROKE_STYLE_OPTIONS: string[] = [
+  "none",
+  "solid",
+  "dashed",
+  "dotted",
+  "double",
+  "hidden",
+  "groove",
+  "ridge",
+  "inset",
+  "outset",
+];
+
 export function formatStrokeSummary(widthPx: number, style: string): string {
   return `${widthPx}px ${style}`;
 }

packages/studio/src/components/editor/propertyPanelFlatStyleSections.test.tsx

@@ -156,6 +156,24 @@ const STROKE_STYLES = {
   "border-color": "rgba(255,255,255,.12)",
 };
 
+function getMetricFieldInput(host: HTMLElement, label: string): HTMLInputElement {
+  const spans = Array.from(host.querySelectorAll("span")).filter((el) => el.textContent === label);
+  for (const span of spans) {
+    const input = span.parentElement?.querySelector<HTMLInputElement>("input");
+    if (input) return input;
+  }
+  throw new Error(`expected a metric field input for "${label}"`);
+}
+
+function setInputValue(input: HTMLInputElement, nextValue: string) {
+  const nativeInputValueSetter = Object.getOwnPropertyDescriptor(
+    window.HTMLInputElement.prototype,
+    "value",
+  )?.set;
+  nativeInputValueSetter?.call(input, nextValue);
+  input.dispatchEvent(new Event("input", { bubbles: true }));
+}
+
 describe("FlatStyleSection — Stroke and Radius", () => {
   it("renders the combined stroke row and commits width+style together on blur", () => {
     const { host, root } = renderSection(STROKE_STYLES);
@@ -172,21 +190,77 @@ describe("FlatStyleSection — Stroke and Radius", () => {
     act(() => root.unmount());
   });
 
-  it("renders a single Radius value with a Linked indicator when corners are uniform", () => {
+  it("clamps an out-of-range stroke width commit to 200px (fix 2)", async () => {
-    const { host, root } = renderSection({ "border-radius": "12px" });
+    const { host, root, onSetStyle } = renderSection(STROKE_STYLES);
-    expect(host.textContent).toContain("Radius");
+    await commitFlatRowInput(host, "Stroke", "9999px solid");
-    expect(getFlatRowInput(host, "Radius").value).toBe("12px");
+    expect(onSetStyle).toHaveBeenCalledWith("border-width", "200px");
-    expect(host.textContent).toContain("Linked");
     act(() => root.unmount());
   });
 
-  it("commits the radius row's new value to border-radius on blur when corners are uniform", async () => {
+  it("rejects a stroke commit whose style token is not a valid border-style (fix 2)", async () => {
+    const { host, root, onSetStyle } = renderSection(STROKE_STYLES);
+    await commitFlatRowInput(host, "Stroke", "12px bogus");
+    expect(onSetStyle).not.toHaveBeenCalled();
+    act(() => root.unmount());
+  });
+
+  it("commits a stroke style change through the discoverable Stroke style select (fix 2)", () => {
+    const { host, root, onSetStyle } = renderSection(STROKE_STYLES);
+    changeFlatSelectRow(host, "Stroke style", "dashed");
+    expect(onSetStyle).toHaveBeenCalledWith("border-style", "dashed");
+    act(() => root.unmount());
+  });
+
+  it("commits a new stroke color through the flat ColorField (fix 1)", () => {
+    const { host, root, onSetStyle } = renderSection({
+      "border-width": "1px",
+      "border-style": "solid",
+      "border-color": "rgb(10, 20, 30)",
+    });
+    const trigger = Array.from(
+      host.querySelectorAll<HTMLButtonElement>('[data-flat-color-trigger="true"]'),
+    ).find((btn) => btn.getAttribute("aria-label") === "Pick stroke color color");
+    if (!trigger) throw new Error("expected the stroke color trigger");
+    act(() => trigger.dispatchEvent(new MouseEvent("click", { bubbles: true })));
+    const hexInput = Array.from(document.querySelectorAll<HTMLInputElement>("input")).find(
+      (input) => !host.contains(input),
+    );
+    if (!hexInput) throw new Error("expected the color picker's hex input");
+    act(() => setInputValue(hexInput, "#112233"));
+    expect(onSetStyle).toHaveBeenCalledWith("border-color", "rgb(17, 34, 51)");
+    act(() => root.unmount());
+  });
+
+  it("uses BorderRadiusEditor for radius, linked by default, even when corners are uniform (fix 3)", () => {
+    const { host, root } = renderSection({ "border-radius": "12px" });
+    const unlinkButton = host.querySelector<HTMLButtonElement>('button[title="Unlink corners"]');
+    expect(unlinkButton).not.toBeNull();
+    expect(getMetricFieldInput(host, "All").value).toBe("12");
+    act(() => root.unmount());
+  });
+
+  it("commits a uniform radius value through BorderRadiusEditor's linked All field", () => {
     const { host, root, onSetStyle } = renderSection({ "border-radius": "12px" });
-    await commitFlatRowInput(host, "Radius", "20px");
+    const allInput = getMetricFieldInput(host, "All");
+    act(() => setInputValue(allInput, "20"));
+    act(() => allInput.dispatchEvent(new Event("focusout", { bubbles: true })));
     expect(onSetStyle).toHaveBeenCalledWith("border-radius", "20px");
     act(() => root.unmount());
   });
 
+  it("commits a single-corner radius update after unlinking a uniform radius (fix 3)", () => {
+    const { host, root, onSetStyle } = renderSection({ "border-radius": "12px" });
+    const unlinkButton = host.querySelector<HTMLButtonElement>('button[title="Unlink corners"]');
+    if (!unlinkButton) throw new Error("expected the unlink toggle button");
+    act(() => unlinkButton.dispatchEvent(new MouseEvent("click", { bubbles: true })));
+    const trInput = getMetricFieldInput(host, "TR");
+    act(() => setInputValue(trInput, "18"));
+    act(() => trInput.dispatchEvent(new Event("focusout", { bubbles: true })));
+    expect(onSetStyle).toHaveBeenCalledWith("border-top-right-radius", "18px");
+    expect(onSetStyle).not.toHaveBeenCalledWith("border-radius", expect.anything());
+    act(() => root.unmount());
+  });
+
   it("falls back to the legacy BorderRadiusEditor when corners are not uniform", () => {
     const { host, root } = renderSection({}, {}, { tl: 4, tr: 12, br: 4, bl: 4 });
     expect(host.textContent).not.toContain("Linked");
@@ -199,14 +273,7 @@ describe("FlatStyleSection — Stroke and Radius", () => {
       (el) => el.value === "12",
     );
     if (!trInput) throw new Error("expected the TR corner input");
-    act(() => {
+    act(() => setInputValue(trInput, "18"));
-      const nativeInputValueSetter = Object.getOwnPropertyDescriptor(
-        window.HTMLInputElement.prototype,
-        "value",
-      )?.set;
-      nativeInputValueSetter?.call(trInput, "18");
-      trInput.dispatchEvent(new Event("input", { bubbles: true }));
-    });
     act(() => {
       trInput.dispatchEvent(new Event("focusout", { bubbles: true }));
     });
@@ -472,6 +539,25 @@ describe("FlatStyleSection — Overflow and Mask", () => {
     expect(onSetStyle).toHaveBeenCalledWith("clip-path", "inset(8px 8px 5px 8px round 4px)");
     act(() => root.unmount());
   });
+
+  it("renders a uniform Mask inset slider and commits clip-path via buildInsetClipPathValue (fix 4)", () => {
+    const { host, root, onSetStyle } = renderSection({ "clip-path": "inset(8px round 4px)" });
+    expect(host.textContent).toContain("Mask inset");
+    const tracks = host.querySelectorAll('[data-flat-slider-track="true"]');
+    // Track order: Layer blur, Backdrop, Mask inset, Opacity.
+    const maskInsetTrack = tracks[2];
+    Object.defineProperty(maskInsetTrack, "getBoundingClientRect", {
+      value: () => ({ left: 0, width: 100, top: 0, height: 2, right: 100, bottom: 2 }),
+    });
+    act(() => {
+      maskInsetTrack.dispatchEvent(new MouseEvent("pointerdown", { bubbles: true, clientX: 50 }));
+    });
+    // clipInsetValue=8 -> max=Math.max(120, 8)=120; clientX=50 of width 100 -> ratio 0.5 -> 60px.
+    // border-radius is unset here, so the clip-path's own `round 4px` is not reused — radiusValue
+    // (read from the `border-radius` style, matching legacy) is 0.
+    expect(onSetStyle).toHaveBeenCalledWith("clip-path", "inset(60px round 0px)");
+    act(() => root.unmount());
+  });
 });
 
 describe("FlatStyleSection — Opacity", () => {

packages/studio/src/components/editor/propertyPanelFlatStyleSections.tsx

@@ -2,13 +2,17 @@
 import { useEffect, useState } from "react";
 import { isTextEditableSelection, type DomEditSelection } from "./domEditing";
 import { buildDefaultGradientModel, serializeGradient } from "./gradientValue";
-import { Link as LinkIcon } from "../../icons/SystemIcons";
 import { BorderRadiusEditor } from "./BorderRadiusEditor";
-import { formatStrokeSummary, parseStrokeSummary } from "./propertyPanelFlatStyleHelpers";
+import {
+  formatStrokeSummary,
+  parseStrokeSummary,
+  STROKE_STYLE_OPTIONS,
+} from "./propertyPanelFlatStyleHelpers";
 import {
   buildBoxShadowPresetValue,
   buildClipPathValue,
   buildInsetClipPathSides,
+  buildInsetClipPathValue,
   buildStrokeStyleUpdates,
   buildStrokeWidthStyleUpdates,
   extractBackgroundImageUrl,
@@ -170,37 +174,65 @@ function FlatStrokeRow({
   );
 
   return (
-    <FlatRow
+    <>
-      label="Stroke"
+      <FlatRow
-      value={summary}
+        label="Stroke"
-      tier={tier}
+        value={summary}
-      disabled={disabled}
+        tier={tier}
-      onCommit={async (next) => {
+        disabled={disabled}
-        const parsed = parseStrokeSummary(next);
+        onCommit={async (next) => {
-        if (!parsed) return;
+          const parsed = parseStrokeSummary(next);
-        for (const [property, value] of buildStrokeWidthStyleUpdates(
+          if (!parsed) return;
-          formatPxMetricValue(parsed.widthPx),
+          if (!STROKE_STYLE_OPTIONS.includes(parsed.style)) return;
-          parsed.style,
+          const normalizedWidth = normalizePanelPxValue(`${parsed.widthPx}px`, {
-        )) {
+            min: 0,
-          await onSetStyle(property, value);
+            max: 200,
+            fallback: borderWidthValue,
+          });
+          if (!normalizedWidth) return;
+          for (const [property, value] of buildStrokeWidthStyleUpdates(
+            normalizedWidth,
+            parsed.style,
+          )) {
+            await onSetStyle(property, value);
+          }
+          for (const [property, value] of buildStrokeStyleUpdates(parsed.style, normalizedWidth)) {
+            await onSetStyle(property, value);
+          }
+        }}
+        suffix={
+          <>
+            <span
+              className="h-4 w-4 flex-shrink-0 rounded border border-panel-border-input"
+              style={{ backgroundColor: borderColorValue }}
+            />
+            <span className="font-mono text-[10px] text-panel-text-3">{borderColorValue}</span>
+          </>
         }
-        for (const [property, value] of buildStrokeStyleUpdates(
+      />
-          parsed.style,
+      <FlatSelectRow
-          formatPxMetricValue(parsed.widthPx),
+        label="Stroke style"
-        )) {
+        value={borderStyleValue}
-          await onSetStyle(property, value);
+        options={STROKE_STYLE_OPTIONS}
-        }
+        tier={resolveValueTier(styles["border-style"], "none")}
-      }}
+        disabled={disabled}
-      suffix={
+        onChange={async (next) => {
-        <>
+          for (const [property, value] of buildStrokeStyleUpdates(
-          <span
+            next,
-            className="h-4 w-4 flex-shrink-0 rounded border border-panel-border-input"
+            formatPxMetricValue(borderWidthValue),
-            style={{ backgroundColor: borderColorValue }}
+          )) {
-          />
+            await onSetStyle(property, value);
-          <span className="font-mono text-[10px] text-panel-text-3">{borderColorValue}</span>
+          }
-        </>
+        }}
-      }
+      />
-    />
+      <ColorField
+        flat
+        label="Stroke color"
+        value={borderColorValue}
+        disabled={disabled}
+        onCommit={(next) => onSetStyle("border-color", next)}
+      />
+    </>
   );
 }
 
@@ -229,7 +261,6 @@ function FlatRadiusRow({
     gsapBorderRadius?.br ?? parseNumericValue(styles["border-bottom-right-radius"]) ?? radiusValue;
   const radiusBL =
     gsapBorderRadius?.bl ?? parseNumericValue(styles["border-bottom-left-radius"]) ?? radiusValue;
-  const uniform = radiusTL === radiusTR && radiusTR === radiusBR && radiusBR === radiusBL;
 
   const commit = (corner: "all" | "tl" | "tr" | "br" | "bl", value: number) => {
     const px = `${formatNumericValue(value)}px`;
@@ -246,41 +277,14 @@ function FlatRadiusRow({
     void onSetStyle(prop, px);
   };
 
-  if (!uniform) {
-    return (
-      <BorderRadiusEditor
-        tl={radiusTL}
-        tr={radiusTR}
-        br={radiusBR}
-        bl={radiusBL}
-        disabled={disabled}
-        onCommit={commit}
-      />
-    );
-  }
-
   return (
-    <FlatRow
+    <BorderRadiusEditor
-      label="Radius"
+      tl={radiusTL}
-      value={`${formatNumericValue(radiusTL)}px`}
+      tr={radiusTR}
-      tier={resolveValueTier(styles["border-radius"], "0px")}
+      br={radiusBR}
+      bl={radiusBL}
       disabled={disabled}
-      onCommit={(next) => {
+      onCommit={commit}
-        const parsed = parsePxMetricValue(next.endsWith("px") ? next : `${next}px`);
-        if (parsed == null) return;
-        const normalized = normalizePanelPxValue(`${parsed}px`, {
-          min: 0,
-          max: 400,
-          fallback: radiusTL,
-        });
-        commit("all", normalized != null ? (parsePxMetricValue(normalized) ?? radiusTL) : radiusTL);
-      }}
-      suffix={
-        <span className="flex items-center gap-1 text-[10px] text-panel-text-4">
-          <LinkIcon size={10} />
-          Linked
-        </span>
-      }
     />
   );
 }
@@ -380,10 +384,7 @@ function FlatBlurSliders({
   );
 }
 
-/* ------------------------------------------------------------------ */
+// Flat Overflow + Mask rows (+ inset sides).
-/*  Flat Overflow + Mask rows (+ inset sides)                          */
-/* ------------------------------------------------------------------ */
-
 function FlatOverflowMaskRows({
   styles,
   disabled,
@@ -396,6 +397,55 @@ function FlatOverflowMaskRows({
   const radiusValue = parseNumericValue(styles["border-radius"]) ?? 0;
   const clipPathValue = styles["clip-path"] || "none";
   const clipPathPreset = inferClipPathPreset(clipPathValue);
+
+  return (
+    <>
+      <FlatSelectRow
+        label="Overflow"
+        value={styles.overflow || "visible"}
+        options={["visible", "hidden", "clip", "auto", "scroll"]}
+        tier={resolveValueTier(styles.overflow, "visible")}
+        disabled={disabled}
+        onChange={(next) => void onSetStyle("overflow", next)}
+        onReset={() => void onSetStyle("overflow", "visible")}
+      />
+      <FlatSelectRow
+        label="Mask"
+        value={clipPathPreset === "custom" ? "none" : clipPathPreset}
+        options={["none", "inset", "circle"]}
+        tier={resolveValueTier(clipPathPreset === "none" ? undefined : clipPathPreset, "none")}
+        disabled={disabled}
+        onChange={(next) => {
+          void onSetStyle(
+            "clip-path",
+            buildClipPathValue(next as "none" | "inset" | "circle", radiusValue, clipPathValue),
+          );
+        }}
+        onReset={() => void onSetStyle("clip-path", "none")}
+      />
+      <FlatMaskInsetRows
+        clipPathValue={clipPathValue}
+        radiusValue={radiusValue}
+        disabled={disabled}
+        onSetStyle={onSetStyle}
+      />
+    </>
+  );
+}
+
+// Flat Mask inset — uniform slider + per-side fields.
+function FlatMaskInsetRows({
+  clipPathValue,
+  radiusValue,
+  disabled,
+  onSetStyle,
+}: {
+  clipPathValue: string;
+  radiusValue: number;
+  disabled: boolean;
+  onSetStyle: (prop: string, value: string) => void | Promise<void>;
+}) {
+  const clipPathPreset = inferClipPathPreset(clipPathValue);
   const parsedClipInsets = parseInsetClipPathSides(clipPathValue);
   const clipInsetValue = getClipPathInsetPx(clipPathValue);
   const clipInsetSides = parsedClipInsets ?? {
@@ -422,28 +472,18 @@ function FlatOverflowMaskRows({
 
   return (
     <>
-      <FlatSelectRow
+      <FlatSlider
-        label="Overflow"
+        label="Mask inset"
-        value={styles.overflow || "visible"}
+        value={clipInsetValue}
-        options={["visible", "hidden", "clip", "auto", "scroll"]}
+        min={0}
-        tier={resolveValueTier(styles.overflow, "visible")}
+        max={Math.max(120, Math.ceil(clipInsetValue))}
+        step={1}
+        tier={clipInsetValue > 0 ? "explicitCustom" : "default"}
+        displayValue={`${formatNumericValue(clipInsetValue)}px`}
         disabled={disabled}
-        onChange={(next) => void onSetStyle("overflow", next)}
+        onCommit={(next) =>
-        onReset={() => void onSetStyle("overflow", "visible")}
+          void onSetStyle("clip-path", buildInsetClipPathValue(next, radiusValue))
-      />
+        }
-      <FlatSelectRow
-        label="Mask"
-        value={clipPathPreset === "custom" ? "none" : clipPathPreset}
-        options={["none", "inset", "circle"]}
-        tier={resolveValueTier(clipPathPreset === "none" ? undefined : clipPathPreset, "none")}
-        disabled={disabled}
-        onChange={(next) => {
-          void onSetStyle(
-            "clip-path",
-            buildClipPathValue(next as "none" | "inset" | "circle", radiusValue, clipPathValue),
-          );
-        }}
-        onReset={() => void onSetStyle("clip-path", "none")}
       />
       {showClipInsetSides && (
         <div className="grid grid-cols-4 gap-2">