fixed PY-10995 Wrapping on right margin deletes code with slashes at the end of miltiline statements.

If we didn't process auto-formatted events from document - document could be broken by replacement.
Do not insert replacement string to the broken textrange

python/testData/wrap/wrapRightMargin.after.py

@@ -0,0 +1,4 @@
+def do_stuff():
+    another_long_variable = a_really_long_function_name_with_parameters(12,
+                                                        this_is_the_first_param=23, 
+                                                 this_is_the_second=45).do_more_stuff_to_the_result()

python/testData/wrap/wrapRightMargin.py

@@ -0,0 +1,3 @@
+def do_stuff():
+    another_long_variable = a_really_long_function_name_with_parameters(12,
+           <caret>this_is_the_first_param=23, this_is_the_second=45).do_more_stuff_to_the_result()

python/testSrc/com/jetbrains/python/PyWrapTest.java

@@ -49,6 +49,28 @@ public class PyWrapTest extends PyTestCase {
     doTest(" AND field");
   }
 
+
+  public void testWrapRightMargin() {
+    final CodeStyleSettings settings = CodeStyleSettingsManager.getInstance(myFixture.getProject()).getCurrentSettings();
+    int oldValue = settings.RIGHT_MARGIN;
+    boolean oldMarginValue = settings.WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN;
+    settings.RIGHT_MARGIN = 100;
+    settings.WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN = true;
+    try {
+      final String testName = "wrap/" + getTestName(true);
+      myFixture.configureByFile(testName + ".py");
+      for (int i = 0; i != 45; ++i) {
+        myFixture.type(' ');
+      }
+      myFixture.checkResultByFile(testName + ".after.py");
+    }
+    finally {
+      settings.RIGHT_MARGIN = oldValue;
+      settings.WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN = oldMarginValue;
+    }
+
+  }
+
   private void doTest(final String textToType) {
     myFixture.configureByFile("wrap/" + getTestName(false) + ".py");
     myFixture.type(textToType);