fix: multi-line snippet indentation when no placeholders

Closes #1635

Author: Saghen

lua/blink/cmp/completion/accept/init.lua

@@ -33,6 +33,9 @@ local function apply_item(ctx, item)
     local parsed_snippet = require('blink.cmp.sources.snippets.utils').safe_parse(item.textEdit.newText)
     if
       parsed_snippet ~= nil
+      -- snippets automatically handle identation on newlines, while our implementation does not,
+      -- so ignore for muli-line snippets
+      and #vim.split(tostring(parsed_snippet), '\n') == 1
       and #parsed_snippet.data.children == 1
       and parsed_snippet.data.children[1].type == vim.lsp._snippet_grammar.NodeType.Text
     then