lsp: insert solitary empty lines when applying text edits

Fixes fatih#3000

Author: bhcleek

autoload/go/lsp.vim

@@ -1536,7 +1536,7 @@ function s:applyTextEdits(msg) abort
     " TODO(bc): deal with folds
 
     call s:deleteline(l:startline, l:endline)
-    for l:line in split(l:text, "\n")
+    for l:line in split(l:text, "\n", 1)
       call append(l:startline-1, l:line)
       let l:startline += 1
     endfor

autoload/go/test-fixtures/fmt/src/imports/goimports.go

@@ -1,13 +1,8 @@
 package main
-
-import (
-	"fmt"
-)
-
 func Foo(log *logging.TestLogger) {
-log.Debug("vim-go")
+	log.Debug("vim-go")
 }
 
 func main() {
-		fmt.Println("vim-go")
+	fmt.Println("vim-go")
 }