[FGCP] Make Class Snippet Parse Filename

[Number-3434]

This is a Fine-Grained Cherry-Pick (FGCP).

Replace ${1:Name} with ${1:${TM_FILENAME_BASE/(.*)/${1:/pascalcase}/}} in

Dart-Code/snippets/dart.json

Lines 98 to 106 in 0ac815d

	"class": {
	"prefix": "class",
	"description": "Insert a class definition.",
	"body": [
	"class ${1:Name} {",
	" $0",
	"}"
	]
	},

...and replace the first $1 with ${TM_FILENAME_BASE/(.*)/${1:/pascalcase}/} in

Dart-Code/snippets/flutter.json

Lines 3 to 18 in 0ac815d

	"Flutter stateless widget": {
	"prefix": "stless",
	"description": "Insert a StatelessWidget",
	"body": [
	"class $1 extends StatelessWidget {",
	" const $1({ Key? key }) : super(key: key);",
	"",
	" @override",
	" Widget build(BuildContext context) {",
	" return Container(",
	" $2",
	" );",
	" }",
	"}"
	]
	},

Dart-Code/snippets/flutter.json

Lines 19 to 39 in 0ac815d

	"Flutter stateful widget": {
	"prefix": "stful",
	"description": "Insert a StatefulWidget",
	"body": [
	"class $1 extends StatefulWidget {",
	" const $1({ Key? key }) : super(key: key);",
	"",
	" @override",
	" _$1State createState() => _$1State();",
	"}",
	"",
	"class _$1State extends State<$1> {",
	" @override",
	" Widget build(BuildContext context) {",
	" return Container(",
	" $2",
	" );",
	" }",
	"}"
	]
	},

Dart-Code/snippets/flutter.json

Lines 40 to 75 in 0ac815d

	"Flutter widget with AnimationController": {
	"prefix": "stanim",
	"description": "Insert a StatefulWidget with an AnimationController",
	"body": [
	"class $1 extends StatefulWidget {",
	" const $1({ Key? key }) : super(key: key);",
	"",
	" @override",
	" _$1State createState() => _$1State();",
	"}",
	"",
	"class _$1State extends State<$1>",
	" with SingleTickerProviderStateMixin {",
	" late AnimationController _controller;",
	"",
	" @override",
	" void initState() {",
	" super.initState();",
	" _controller = AnimationController(vsync: this);",
	" }",
	"",
	" @override",
	" void dispose() {",
	" super.dispose();",
	" _controller.dispose();",
	" }",
	"",
	" @override",
	" Widget build(BuildContext context) {",
	" return Container(",
	" $2",
	" );",
	" }",
	"}"
	]
	}

This will make the snippet parse the filename (without the extensions), and sets it as the class name (converted to PascalCase).

[DanTup]

Most users wouldn't see this change because these are legacy snippets and snippets now come from the server - see my comment at #4691 (comment).

I think if we do this, it should be in the server instead.

[Number-3434]

Okay 👍.