keep indention when insert next line only when necessary such as binary operators (like `-`, `+`, `*`, `%in%`, `%>%`)

[Yunuuuu]

this is ccurrent implement

a <- b + # type `ENTER` to input next line, and next line won't have indention

a <- b +
    d + # type `ENTER` to input next line, and next line will have indention


a <- b +
    d # type `ENTER` to input next line, and next line will have indention even it's necessary to add indention

this is anticipated implement

a <- b + # type `ENTER` to input next line, and next line should have indention

a <- b +
    d + # type `ENTER` to input next line, and next line will have indention


a <- b +
    d # type `ENTER` to input next line, and next line shouldn't add indention

[Yunuuuu]

It seems the current implement of indention for next line is based on current line indention

[Yunuuuu]

I have tried to using this setting in vscode-R\language\r-configuration.json according to vscode document:

	"indentationRules": {
		"increaseIndentPattern": "(%.*%|[\\^+\\-*/<>=!&|~?])\\s*$",
		"indentNextLinePattern": "(%.*%|[\\^+\\-*/<>=!&|~?])\\s*$"
	}

but it didn't work, it's weird.

[PMassicotte]

Anyone made this working?

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