No syntax highlighting on single-line XML

[HTD]

• VSCode Version: Code - Insiders 1.20.0-insider (ca023a7, 2018-01-12T05:14:50.541Z)
• OS Version: Windows_NT x64 10.0.16299
• Extensions (7)

  Extension	Author (truncated)	Version
  vscode-markdownlint	Dav	0.12.1
  vscode-eslint	dba	1.4.3
  xml	Dot	1.9.2
  tslint	eg2	1.0.24
  python	ms-	0.9.1
  csharp	ms-	1.13.1
  team	ms-	1.122.0

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Steps to Reproduce:

1. Open file C:\Windows\Performance\WinSAT\DataStore*Formal.Assessment (Initial).WinSAT.xml
2. Notice that XML syntax is not highlighted since this XML is all in one line, however it is still a perfectly valid XML and as such should be highlighted.

Reproduces without extensions: Yes

[aeschli]

@HTD Can you paste that line to this issue?

[typeoneerror]

@aeschli same issue here. a .js file with an array that is 11566 characters on one line (can't share the data, unfortunately private). I can share that syntax highlighting stops at column 1000 which seems significant.

[aeschli]

Oh, now remember. We have a limit on the line length (20'000 characters). Lines that are longer will not be colourized. That's necessary for performance reasons.

[typeoneerror]

@aeschli just to confirm, I have a 11,566 character file and if I delete everything after character 1000, highlighting starts working again. Should my file not be syntax highlighted at < 20K? Looks like the limit is actually 1000? 🧐

[aeschli]

The code says 20'000, and its also what I see:

[aeschli]

Please paste your example to a gist or in this issue, maybe it's something else.

[typeoneerror]

@aeschli below is 1022 characters.

Deleting to 1000 and syntax shows up again:

1022 data:

/* eslint-disable*/ export const hpData = [{"name":"TESTING","type":"ABC","values":[10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000]},{"name":"TESTING","type":"ABC","values":[null,null,null,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000]},{"name":"TESTING","type":"ABC","values":[null,null,null,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000]},{"name":"TESTING","type":"ABC","values":[null,null,null,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000]},{"name":"TESTING","type":"ABC","values":[null,null,null,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000]}]; 

• VSCode Version: Code 1.19.2 (490ef76, 2018-01-10T15:49:04.682Z)
• OS Version: Darwin x64 17.3.0
• Extensions:

Extension	Author (truncated)	Version
bracket-pair-colorizer	Coe	0.10.14
vscode-eslint	dba	1.4.4
flow-for-vscode	flo	0.7.3
vscode-language-babel	mgm	0.0.11
debugger-for-chrome	msj	4.0.0
Ruby	reb	0.15.0
vscode-icons	rob	7.19.0
language-stylus	sys	1.8.0
vim	vsc	0.10.11
vscode-todo-highlight	way	0.5.11

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Could be issue with Babel Javascript syntax highlighter?