{"record":{"id":"a25c348c55e24d10","repo":"Foundry376/Mailspring","slug":"thumbnail-generation-timed-out-for-filepath","errorCode":null,"errorMessage":"Thumbnail generation timed out for ${filePath}","messagePattern":"Thumbnail generation timed out for (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"app/src/quickpreview/index.ts","lineNumber":420,"sourceCode":"  // Start the thumbnail generation\n  captureWindow\n    .loadFile(path.join(filesRoot, 'renderer.html'), {\n      search: JSON.stringify({ strategy, mode: 'capture', filePath, previewToken }),\n    })\n    .catch((err: Error) => {\n      // ERR_ABORTED is expected when a new preview starts while the previous is still loading\n      // (e.g. after the 5-second timeout fires). The thumbnail just won't be generated.\n      if (!err?.message?.includes('ERR_ABORTED')) {\n        console.error('Quickpreview capture window failed to load:', err);\n      }\n    });\n\n  // Race against a timer to complete the preview. We don't want this to hang\n  // forever if for some reason the window encounters an exception\n  let onFinalize = null;\n\n  const timer = setTimeout(() => {\n    console.warn(`Thumbnail generation timed out for ${filePath}`);\n    onFinalize(false);\n  }, 5000);\n\n  const onRendererSuccess = () => {\n    onFinalize(true);\n  };\n\n  onFinalize = (success) => {\n    captureWindowInUse = false;\n    clearTimeout(timer);\n    if (captureWindow) {\n      captureWindow.removeListener('page-title-updated', onRendererSuccess);\n    }\n    // Clean up the token if preview failed (on success, IPC handler deletes it)\n    if (!success) {\n      cleanupPreviewToken(previewToken);\n    }\n    process.nextTick(_generateNextCrossplatformPreview);","sourceCodeStart":402,"sourceCodeEnd":438,"githubUrl":"https://github.com/Foundry376/Mailspring/blob/648c685d602ece6bb00c22534b8734de6ac644b3/app/src/quickpreview/index.ts#L402-L438","documentation":"Warning in the quickpreview queue: rendering the attachment in the capture window raced against a 5-second timer and lost — the thumbnail request for filePath is abandoned and its loadFile is aborted (surfacing an expected ERR_ABORTED). Slow-rendering files (huge PDFs/images) hit this regularly.","triggerScenarios":"Thrown at app/src/quickpreview/index.ts:420 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Retry generating the preview — often the second pass renders faster from cache","Increase the race timeout for large attachments","Pre-generate or downsample oversized files before capture"],"exampleFix":null,"handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"648c685d602ece6bb00c22534b8734de6ac644b3","analyzedAt":"2026-09-03T02:00:24.311Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-10T07:17:11.731Z"}