Remove attempt at fixing the (null) bug

java/src/name/fraser/neil/plaintext/diff_match_patch.java

@@ -1576,16 +1576,7 @@ private String decodeURI(String text) throws IllegalArgumentException {
       throw new IllegalArgumentException();
     }
 
-    // some objective-c versions of the library produced patches with
-    // (null) in the place where surrogates were split across diff
-    // boundaries. if we leave those in we'll be stuck with a
-    // high-surrogate (null) low-surrogate pattern that will break
-    // deeper in the library or consuming application. we'll "fix"
-    // these by dropping the (null) and re-joining the surrogate halves
-    return decoded.toString().replaceAll(
-      "([\\uD800-\\uDBFF])\\(null\\)([\\uDC00-\\uDFFF])",
-      "$1$2"
-    );
+    return decoded.toString();
   }
 
   /**

java/tests/name/fraser/neil/plaintext/diff_match_patch_test.java

@@ -460,12 +460,6 @@ public static void testDiffDelta() {
       dmp.diff_toDelta(dmp.diff_fromDelta("\ud83c\udd70", "=1\t-1\t+%ED%B5%B1"))
     );
 
-    assertEquals(
-      "diff_fromDelta: Invalid diff from objective-c with (null) string",
-      diffList(new Diff(INSERT, "\ud83c\udd70")),
-      dmp.diff_fromDelta("", "+%ED%A0%BC%28null%29%ED%B5%B0")
-    );
-
     // Verify pool of unchanged characters.
     diffs = diffList(new Diff(INSERT, "A-Z a-z 0-9 - _ . ! ~ * ' ( ) ; / ? : @ & = + $ , # "));
     String text2 = dmp.diff_text2(diffs);

javascript/diff_match_patch_uncompressed.js

@@ -1361,7 +1361,6 @@ diff_match_patch.prototype.diff_toDelta = function(diffs) {
   var text = [];
   var lastEnd;
   for (var x = 0; x < diffs.length; x++) {
-
     var thisDiff = diffs[x];
     var thisTop = thisDiff[1][0];
     var thisEnd = thisDiff[1][thisDiff[1].length - 1];
@@ -1512,13 +1511,7 @@ diff_match_patch.prototype.decodeURI = function(text) {
       throw new URIError('URI malformed');
     }
 
-    // some objective-c versions of the library produced patches with
-    // (null) in the place where surrogates were split across diff
-    // boundaries. if we leave those in we'll be stuck with a
-    // high-surrogate (null) low-surrogate pattern that will break
-    // deeper in the library or consuming application. we'll "fix"
-    // these by dropping the (null) and re-joining the surrogate halves
-    return decoded.replace(/([\uD800-\uDBFF])\(null\)([\uDC00-\uDFFF])/g, "$1$2");
+    return decoded;
   }
 };
 

javascript/tests/diff_match_patch_test.js

@@ -546,7 +546,7 @@ function testDiffDelta() {
 
     for(let i = 0; i < 1000; i++) {
       newText = applyRandomTextEdit(originalText);
-      dmp.patch_toText(dmp.patch_make(originalText, newText));
+      dmp.diff_toDelta(dmp.diff_main(originalText, newText));
     }
   })();
 
@@ -605,15 +605,6 @@ function testDiffDelta() {
     assertEquals('Swap surrogate pair', 'crashed');
   }
 
-  try {
-    assertEquivalent(
-      dmp.diff_fromDelta('', '+%ED%A0%BC%28null%29%ED%B5%B0'),
-      [[DIFF_INSERT, '\ud83c\udd70']]
-    );
-  } catch ( e ) {
-    assertEquals('Invalid diff from objective-c with (null) string' );
-  }
-
   // Empty diff groups
   assertEquivalent(
     dmp.diff_toDelta([[DIFF_EQUAL, 'abcdef'], [DIFF_DELETE, ''], [DIFF_INSERT, 'ghijk']]),

objectivec/Tests/DiffMatchPatchTest.m

@@ -814,10 +814,6 @@ - (void)test_diff_deltaTest {
                                             [Diff diffWithOperation:DIFF_INSERT andText:[NSString stringWithFormat:@"%C", 0xdd71]],
                                             nil])]);
 
-    // Invalid diff from objective-c with (null) string
-    XCTAssertEqualObjects([dmp diff_fromDeltaWithText:@"" andDelta:@"+%ED%A0%BC%28null%29%ED%B5%B0" error:nil],
-                          ([NSMutableArray arrayWithObjects:[Diff diffWithOperation:DIFF_INSERT andText:@"🅰"],nil]));
-
   // Verify pool of unchanged characters.
   diffs = [NSMutableArray arrayWithObject:
        [Diff diffWithOperation:DIFF_INSERT andText:@"A-Z a-z 0-9 - _ . ! ~ * ' ( ) ; / ? : @ & = + $ , # "]];