Syntax Highlighting for Batch scripts doesn't handle percent escapes

[pedro-w]

• VSCode Version: Code 1.19.3 (7c4205b, 2018-01-25T10:36:43.673Z)
• OS Version: Windows_NT ia32 10.0.16299
• Extensions:

Extension	Author (truncated)	Version
vscode-svgviewer	css	1.4.3
vbscript	Dar	1.0.4
vscode-firefox-debug	hbe	1.0.1
copy-markdown-as-html	jer	1.0.0
cpptools	ms-	0.14.6
csharp	ms-	1.13.1
debugger-for-edge	msj	0.4.1
svg-snippets	sid	1.0.1
markdown-pdf	yza	0.1.7

If a batch script references a file with a percent (%) sign in it, the percent needs to be doubled to escape it. VS code seems not to apply correct syntax highlighting to this.

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Steps to Reproduce:

1. Save a batch file containing (for example) text copy "50% done.txt" %K%
2. Make sure Language Mode is Batch
3. See highlighting is not right

Reproduces without extensions: Yes

[aeschli]

This issue was moved to mmims/language-batchfile#24