adds sensitivity to pasted newlines in multi-line input

src/threecode/minline.nim

@@ -1533,10 +1533,20 @@ proc handleEscape*(ed: var LineEditor, c1: int): bool =
               if stars > 0:
                 ed.write repeat('*', stars)
             else:
+              # Normalize line endings: `\r\n` -> `\n`, bare `\r` ->
+              # `\n`. A bare CR is itself a valid line separator (classic
+              # Mac, some terminals/clipboards), so stripping every `\r`
+              # would collapse a CR-separated paste into one line.
               var clean = newStringOfCap(paste.len)
+              var prev = '\0'
               for ch in paste:
-                if ch == '\r': discard
-                else: clean.add ch
+                if ch == '\r':
+                  if prev != '\n': clean.add '\n'
+                elif ch == '\n':
+                  if prev != '\r': clean.add '\n'
+                else:
+                  clean.add ch
+                prev = ch
               ed.insertText(clean)
         return false
       if c3 == 51 and c4 == 59:

tests/core/test_minline.nim

@@ -740,6 +740,29 @@ suite "minline editor: bracketed paste":
     check d.run(ed, prompt = "> ") == "line1\nline2"
     check ed.echoRows == 2
 
+  test "paste with CRLF line endings keeps one break per line":
+    var ed = initEditor()
+    let d = newDriver()
+    d.push @[27, 91, 50, 48, 48, 126]
+    d.pushString "line1\r\nline2\r\nline3"
+    d.push @[27, 91, 50, 48, 49, 126]
+    d.push Enter
+    check d.run(ed, prompt = "> ") == "line1\nline2\nline3"
+    check ed.echoRows == 3
+
+  test "paste with bare-CR line endings keeps breaks (not collapsed)":
+    # Regression: a bracketed paste whose content uses bare CR (0x0D) as
+    # the line separator — classic Mac, some terminals/clipboards — used
+    # to collapse to one line because the clean step stripped every CR.
+    var ed = initEditor()
+    let d = newDriver()
+    d.push @[27, 91, 50, 48, 48, 126]
+    d.pushString "line1\rline2\rline3"
+    d.push @[27, 91, 50, 48, 49, 126]
+    d.push Enter
+    check d.run(ed, prompt = "> ") == "line1\nline2\nline3"
+    check ed.echoRows == 3
+
   test "hidechars: bracketed paste captures key, screen shows only `*`s":
     # Regression for the Ghostty-on-macOS auth-failure report. Pasting an
     # api key in hidden mode must: