Non-quoted attribute value in emmet abbreviation breaks parsing with attribute later down in abbreviation

[Koneke]

Issue Type: Bug

In emmet abbreviations with several tag attributes included, a non-quoted attribute value causes the entire abbreviation until the next tag with an attribute to not be expanded.

Expected:

a[href=#]>p>a[href=#]

should expand into:

<a href="#">
  <p><a href="#"></a></p>
</a>

but instead expands into:

a[href=#]>p><a href="#"></a>

I.e., it expands as if everything up until the final a[href=#] was ignored.

This has been tried with extensions entirely disabled, with other emmet abbreviation structures, and with different attribute values, to the same result.

(edit: included recording)

VS Code version: Code 1.57.1 (507ce72, 2021-06-17T13:28:07.755Z)
OS version: Windows_NT x64 10.0.19043
Restricted Mode: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-4690K CPU @ 3.50GHz (4 x 3498)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: enabled_on video_decode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	7.94GB (1.76GB free)
Process Argv	--crash-reporter-id 378cd57f-0e8a-4c1c-ab47-db31f5325277
Screen Reader	no
VM	0%

Extensions (15)

Extension	Author (truncated)	Version
emmet-keybindings	agu	1.0.1
chronicler	arc	0.1.11
vscode-tailwindcss	bra	0.6.11
todo-tree	Gru	0.0.213
rest-client	hum	0.24.5
csharp	ms-	1.23.12
python	ms-	2021.6.944021595
vscode-pylance	ms-	2021.6.2
jupyter	ms-	2021.6.999406279
remote-wsl	ms-	0.56.5
cpptools	ms-	1.4.1
mono-debug	ms-	0.16.2
godot-csharp-vscode	nei	0.1.3
vim	vsc	1.21.3
vsc-jsonsnippets	wmo	0.9.3

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pythonptprofiler:30281270
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pythondataviewer:30285071
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vscod805:30301674
vscextlangct:30322307
binariesv615:30323119
vsccppwt:30322536

[rzhao271]

Created an upstream issue. The abbreviation expands properly, but it's not being extracted properly in the first place.