From 3e0e9a437ba721d94027408ecc313e6b4a90bc02 Mon Sep 17 00:00:00 2001
From: Marc Durdin <marc@durdin.net>
Date: Fri, 18 Sep 2026 15:18:26 +0200
Subject: [PATCH] fix(web): retry importScripts NetworkErrors in attempt to
 mitigate errors loading models

A deeper workaround is applied in 19.0 (see for example #16565, #16586)
but for 18.0, this is an attempt to bypass the constant issue of models
failing to load with Chrome 152 and later versions, by retrying on
failure.

Relates-to: #13862 (may fix)
---
 .../worker-thread/src/main/index.ts              | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/web/src/engine/predictive-text/worker-thread/src/main/index.ts b/web/src/engine/predictive-text/worker-thread/src/main/index.ts
index d0676992e0..56831d142b 100644
--- a/web/src/engine/predictive-text/worker-thread/src/main/index.ts
+++ b/web/src/engine/predictive-text/worker-thread/src/main/index.ts
@@ -242,13 +242,25 @@ export default class LMLayerWorker {
     }
   }
 
-  private loadModelFile(url: string) {
+  private loadModelFile(url: string, tryCount: number = 0) {
     // The self/global WebWorker method, allowing us to directly import another script file into WebWorker scope.
     // If built correctly, the model's script file will auto-register the model with loadModel() above.
     try {
       this._importScripts(url);
     } catch (err) {
-      this.error("Error occurred when attempting to load dictionary", err);
+      // #13862: attempt to mitigate NetworkError on Chrome by retrying before giving up
+      tryCount++;
+      if(err instanceof Error && err.name == 'NetworkError') {
+        if(tryCount < 4) {
+          // increase delay with each retry: 10msec, 100msec, 1000msec
+          console?.warn(`NetworkError when attempting to load dictionary (attempt ${tryCount} of 4, will retry after ${10 ** tryCount} msec): ${err.toString()}`);
+          setTimeout(() => this.loadModelFile(url, tryCount), 10 ** tryCount);
+        } else {
+          this.error(`NetworkError when attempting to load dictionary (attempt ${tryCount} of 4, giving up): ${err.toString()}`);
+        }
+      } else {
+        this.error("Error occurred when attempting to load dictionary", err);
+      }
     }
   }