bug#64697: 29.0.92: cannot paste NUL on macOS (regression from Emacs 28)

["Mattias Engdegård" <mattias.engdegard@gmail.com>]

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In Emacs 29, text pasted from the clipboard on macOS will be truncated if containing NULs.

Reproduction: copy text with NUL in the middle from Emacs 28 (or any other application), and paste into Emacs 29.

This was probably caused by 7e3c2b553f, where construction of a Lisp string was changed from make_string to build_string.

Suggested patch attached. If valid, would it qualify for emacs-29?


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diff --git a/src/nsfns.m b/src/nsfns.m
index 8804a7df7cf..d7ad0fa8341 100644
--- a/src/nsfns.m
+++ b/src/nsfns.m
@@ -3829,7 +3829,8 @@ handled fairly well by the NS libraries (displayed with distinct
 /* Make a Lisp string from an NSString.  */
 - (Lisp_Object)lispString
 {
-  return build_string ([self UTF8String]);
+  return make_string ([self UTF8String],
+                      [self lengthOfBytesUsingEncoding: NSUTF8StringEncoding]);
 }
 @end