Unable to open an untitled document with large size content (approximate > 5MB)

[Huachao]

• VSCode Version: 1.15.0
• OS Version: macOS 10.12.2

Steps to Reproduce:

1. Call the API workspace.openTextDocument({ 'language': language, 'content': content }) to open a new untitled document. If content is larger than 5MB, our code receives following error expected URI untitled:Untitled-1 to have come to LIFE

[Huachao]

Maybe the cause is that the file content is larger than the sync limit https://github.com/Microsoft/vscode/blob/ae58b6765beca28c621aa6b4a3ba48630d58daff/src/vs/editor/common/model/textModel.ts#L115-L118

So in mainThreadDocument.ts won't add this to _modelIsSynced. https://github.com/Microsoft/vscode/blob/ae58b6765beca28c621aa6b4a3ba48630d58daff/src/vs/workbench/api/electron-browser/mainThreadDocuments.ts#L151-L154

Which finally caused the sync model check failed https://github.com/Microsoft/vscode/blob/ae58b6765beca28c621aa6b4a3ba48630d58daff/src/vs/workbench/api/electron-browser/mainThreadDocuments.ts#L238-L240

So if so, is this a right behavior for opening a large file size content? Maybe we should also check if it's larger than size limit, if larger, no error should be thrown.

[alexdima]

Yes, that constant is the root cause. Let's continue discussion in #32118, we should probably simply increase the constant.