Inform when syntax highlighting or word wrap is turned off for large files

[asjJRAutomation]

Issue Type

Bug

Description

Any XML-based file with a non-xml extension has no syntax highlighting, even if the Language Mode is set to XML. After changing the file extension to .xml without changing any file contents, syntax highlighting works correctly.

VS Code Info

VS Code version: Code 1.20.1 (f88bbf9, 2018-02-13T15:34:36.336Z)
OS version: Windows_NT x64 10.0.16299

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-6920HQ CPU @ 2.90GHz (8 x 2904)
Memory (System)	31.94GB (14.67GB free)
Process Argv	C:\Program Files\Microsoft VS Code\Code.exe D:\Source\JR\Personal\JR.CadTools\bin\Release\Deployment\product.wxs
Screen Reader	no
VM	0%

Extensions: none Reproduces without extensions

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• No syntax highlighting on single-line XML (#41593)
• Search and Replace in broken in files using only CR as line-ending (#40908)
• [xml] Closing XML element with namespace prefix generates element without local-name (#203)

[RMacfarlane]

What extension did the file previously have before you changed it to .xml? Syntax highlighting for xml is being applied when a file has one of these extensions:

".xml",".xsd",".ascx",".atom",".axml",".bpmn",".config",".cpt",".csl",".csproj",".csproj.user",".dita",".ditamap",".dtd",".dtml",".fsproj",".fxml",".iml",".isml",".jmx",".launch",".menu",".mxml",".nuspec",".opml",".owl",".proj",".props",".pt",".publishsettings",".pubxml",".pubxml.user",".rdf",".rng",".rss",".shproj",".storyboard",".svg",".targets",".tld",".tmx",".vbproj",".vbproj.user",".vcxproj",".vcxproj.filters",".wsdl",".wxi",".wxl",".wxs",".xaml",".xbl",".xib",".xlf",".xliff",".xpdl",".xul",".xoml"

or the first line matches (\\<\\?xml.*)|(\\<svg)|(\\<\\!doctype\\s+svg)

[asjJRAutomation]

The extension is .wxs (WiX Installer XML), so it does have a match in the predefined extensions. The first line in the file is a standard XML declaration with encoding. <?xml version="1.0" encoding="utf-8"?>

[aeschli]

That's strange: .wxs is already in the list of files associated to the xml mode.
So this just works for me:

• create a file foo.wxs with content <abc></abc>
• Open in VSCode. Editor mode shows XML, syntax highlighting works.

This also works for me:

• create file foo.wxs1 with content <abc></abc>
• open in VSCode. Editor shows mode 'Plain text'
• switch mode to 'XML`. XML syntax highlighting works.

Also this works:

• create file foo.wxs2 with content <?xml version="1.0" encoding="utf-8"?><abc></abc>
• open in VSCode. Editor shows mode 'XML'. XML syntax highlighting works.

@asjJRAutomation Can you give your steps? Please verify that no other extension redefines the XML mode.

[asjJRAutomation]

I originally thought I was having a problem with many files, but now I'm only able to recreate the problem with a particular file. The file I'm having an issue with is a .wxs file that was generated by the WiX heat.exe application. It generates a .wxs file from input files. I've attached the file (with a .txt extension, GitHub would not allow upload of .wxs)

It is a very large file (20MB). Maybe the file size is the issue?

product.wxs.txt

[aeschli]

Oh, yes, there's a 20MB limit where tokenization will be disabled.
@alexandrudima We need to to at least print a warning to the console, even better some kind of notification to the users.

[alexdima]

Yes, now that notifications are not so invasive, we could add a passive notification informing about this, and also about the case of a very long line...

[alexdima]

To verify, try opening a very large file.