Avoid trailing newline after translation of a linewise selection

autoload/deepl.vim

@@ -1,7 +1,7 @@
 " Send a translation request to deepl using curl
 function! deepl#translate(input, target_lang, source_lang = "")
   let data = #{
-        \ text: [a:input],
+        \ text: split(a:input, '\n\n'),
         \ target_lang: a:target_lang,
         \ }
   if a:source_lang != ""
@@ -14,8 +14,27 @@ function! deepl#translate(input, target_lang, source_lang = "")
   let cmd = cmd .. ' -d ' .. shellescape(json_encode(data))
 
   try
+    " Note: Somewhere in Q4/2025-Q1/2026 DeepL seems to have changed the API
+    "       and since then all(?) newlines are translated to spaces in the
+    "       reply.
+    "       So the workaround below for the trailing newline is no longer needed.
+    "
+    " {"target_lang":"EN","text":["Zeile1\nZeile2\n"]}
+    " ==>
+    " {"translations":[{"text":"Line1 Line2 ","detected_source_language":"DE"}]}
     const res = json_decode(system(cmd))
-    return res["translations"][0]["text"]
+    " But now the preformatting (via newlines) gets lost...
+    "
+    " This is fixed here by splitting the text on double newlines (paragraph
+    " boundaries) above and join it after translation again the same way.
+    "
+    let res2 = []
+    for p in res["translations"]
+      call add(res2, p["text"])
+    endfor
+    " Remove final trailing space character
+    " (needed when translating a visual linewise block)
+    return substitute(join(res2, "\n\n"), " $", "", "")
 
   catch /.*/
     echoerr "error: " .. v:exception
@@ -29,6 +48,13 @@ function! deepl#v(target_lang, source_lang = "")
   let l:paste = &paste
   set paste
 
+  " Workaround no longer needed, see above.
+  " Avoid superfluous trailing newline after translating a visual linewise
+  " selection by changing it to a characterwise selection.
+  "if mode() == "V"
+  "  execute "normal! \<ESC>`<v`>h\<ESC>gv"
+  "endif
+
   try
     " Apply transformation to the text
     if a:source_lang == ""