Fix asset editor local dir interaction

Ignore filesystem file change notifications
that are likely from our making edits in the
asset editor, so that the editor isn't
refreshed and changing out from under us.

Author: fredsa

src/ide/ui.ts

@@ -696,6 +696,7 @@ async function getLocalFilesystem(repoid: string): Promise<ProjectFilesystem> {
     alertError(`Could not get permission to access filesystem.`);
     return;
   }
+  const lastWriteTime: { [path: string]: number } = {};
   return {
     getFileData: async (path) => {
       console.log('getFileData', path);
@@ -708,6 +709,7 @@ async function getLocalFilesystem(repoid: string): Promise<ProjectFilesystem> {
       return contents;
     },
     setFileData: async (path, data) => {
+      lastWriteTime[path] = Date.now();
       const fileHandle = await dirHandle.getFileHandle(path, { create: true });
       const writable = await fileHandle.createWritable();
       await writable.write(data);
@@ -724,7 +726,12 @@ async function getLocalFilesystem(repoid: string): Promise<ProjectFilesystem> {
           // TODO Handle different types of changes intelligently.
           // https://developer.mozilla.org/docs/Web/API/FileSystemChangeRecord#type
           if (record.changedHandle) {
-            callback(record.changedHandle.name);
+            const path = record.changedHandle.name;
+            // Ignore filesystem notifications that are likely from our own recent writes,
+            // so that onFileChanged in ui.ts doesn't call assets editor's refresh(true).
+            // TODO: Consider better options than a time based threshold.
+            if (Date.now() - (lastWriteTime[path] || 0) < 2000) continue;
+            callback(path);
           }
         }
       });