pull the filename from the +++ line

aider/coders/search_replace.py

@@ -584,7 +584,6 @@ def flexible_search_and_replace(texts, strategies):
         for preproc in preprocs:
             res = try_strategy(texts, strategy, preproc)
             if res:
-                dump(strategy, preproc)
                 return res
 
 

aider/coders/udiff_coder.py

@@ -334,8 +334,8 @@ def process_fenced_block(lines, start_line_num):
     block = lines[start_line_num:line_num]
     block.append("@@ @@")
 
-    if block[0].startswith("--- "):
-        fname = block[0].split()[1]
+    if block[1].startswith("+++ "):
+        fname = block[1].split()[1]
         block = block[2:]
     else:
         fname = None

docs/unified-diffs.md

@@ -444,4 +444,4 @@ seems to be an important part of successful GPT code editing.
 Most LLMs will have already seen plenty of unified diffs
 in their normal training data, and so should be
 very amenable to fining tuning towards this
-particular style of diff.
+particular diff style.