fix: After modifying style, it takes two clicks to select the next instance (#4314)

## Description
Style Source looses focus after adding Token


closes #4309
closes #4306

## Steps for reproduction

1. click button
2. expect xyz

## Code Review

- [ ] hi @kof, I need you to do
  - conceptual review (architecture, feature-correctness)
  - detailed review (read every line)
  - test it on preview

## Before requesting a review

- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")

## Before merging

- [ ] tested locally and on preview environment (preview dev login:
5de6)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env` file

Author: istarkov

apps/builder/app/builder/builder.tsx

@@ -345,6 +345,16 @@ export const Builder = ({
     }
   }, []);
 
+  /**
+   * Prevent Radix from stealing focus during editing in the style sources
+   * For example, when the user select or create new style source item inside a dialog.
+   */
+  const handleKeyDown = useCallback((event: React.KeyboardEvent) => {
+    if (event.target instanceof HTMLInputElement) {
+      canvasApi.setInert();
+    }
+  }, []);
+
   /**
    * Prevent Radix from stealing focus during editing in the settings panel.
    * For example, when the user modifies the text content of an H1 element inside a dialog.
@@ -359,6 +369,7 @@ export const Builder = ({
         style={{ display: "contents" }}
         onPointerDown={handlePointerDown}
         onInput={handleInput}
+        onKeyDown={handleKeyDown}
       >
         <ChromeWrapper
           isPreviewMode={isPreviewMode}

apps/builder/app/canvas/shared/inert.ts

@@ -1,19 +1,31 @@
 let resetTimeoutHandle: number | undefined = undefined;
 
 const resetAutoDisposeInert = () => {
+  if (resetTimeoutHandle === undefined) {
+    return;
+  }
   document.body.removeAttribute("inert");
   clearTimeout(resetTimeoutHandle);
   resetTimeoutHandle = undefined;
 };
 
+let lastPointerEventTime = Date.now();
 // 1000 ms is a reasonable time for the preview to reset.
 // Anyway should never happen after user has finished preview changes (can happen during preview changes)
 const AUTO_DISPOSE_INERT_TIMEOUT = 1000;
 
 // A brief delay to ensure mutation observers within the focus scope are activated by the preview changes.
 const DISPOSE_INERT_TIMEOUT = 300;
 
+const PREVENT_INERT_TIMEOUT = 100;
+
 const setAutoDisposeInert = (timeout: number) => {
+  // Some events in the builder can occur after clicking on the canvas (e.g., blur on an input field).
+  // In such cases, we should prevent 'inert' from being set and allow the selection to complete.
+  if (Date.now() - lastPointerEventTime < PREVENT_INERT_TIMEOUT) {
+    return;
+  }
+
   document.body.setAttribute("inert", "true");
 
   // To prevent a completely non-interactive canvas due to edge cases,
@@ -31,3 +43,10 @@ const setAutoDisposeInert = (timeout: number) => {
  */
 export const setInert = () => setAutoDisposeInert(AUTO_DISPOSE_INERT_TIMEOUT);
 export const resetInert = () => setAutoDisposeInert(DISPOSE_INERT_TIMEOUT);
+
+// window.self !== window.top means we are on canvas
+if (typeof window !== "undefined" && window.self !== window.top) {
+  window.addEventListener("pointerdown", () => {
+    lastPointerEventTime = Date.now();
+  });
+}