Scroll to snippet input location on tab

[brunnerh]

For very long snippets it can happen that one of the parameterized locations is outside the viewport. It would be helpful if upon tab the cursor location is scrolled into view.

Example typescript snippet where $2 is quite far down:

"Custom Element": {
	"prefix": "custom-element",
	"body": [
		"class ${1:MyComponent} extends HTMLElement",
		"{",
		"\tstatic get observedAttributes()",
		"\t{",
		"\t\treturn [];",
		"\t}",
		"",
		"\tconnectedCallback()",
		"\t{",
		"\t}",
		"",
		"\tdisconnectedCallback()",
		"\t{",
		"\t}",
		"",
		"\tattributeChangedCallback(name: string, oldValue: string, newValue: string)",
		"\t{",
		"\t}",
		"",
		"\tconstructor()",
		"\t{",
		"\t\tsuper();",
		"",
		"\t}",
		"}",
		"",
		"customElements.define(\"$2\", $1);"
	],
	"description": "Creates custom element stub."
}