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feat: return empty response to textDocument/formatting if no changes

Do not send "edits" if the content remains unchanged after LSP formatting. Otherwise, Neovim reports an unsaved buffer even when no actual changes were made

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script/core
- formatting.lua

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`‎script/core/formatting.lua`

Lines changed: 4 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -21,6 +21,10 @@ return function(uri, options)`
`21`	`21`	`return`
`22`	`22`	`end`
`23`	`23`
	`24`	`+ if text == formattedText then`
	`25`	`+ return`
	`26`	`+ end`
	`27`	`+`
`24`	`28`	`return {`
`25`	`29`	`{`
`26`	`30`	`start = state.ast.start,`

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Commit 7ea9e7c

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`‎script/core/formatting.lua`

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