WI-40696 Spellchecker considers known capitalized word incorrect

spellchecker/src/com/intellij/spellchecker/SpellCheckerManager.java

@@ -222,18 +222,18 @@ public class SpellCheckerManager implements Disposable {
         UndoManager.getInstance(project).undoableActionPerformed(new BasicUndoableAction(file) {
           @Override
           public void undo() {
-            dictionary.removeFromDictionary(word);
+            dictionary.removeFromDictionary(transformed);
             restartInspections();
           }
 
           @Override
           public void redo() {
-            dictionary.addToDictionary(word);
+            dictionary.addToDictionary(transformed);
             restartInspections();
           }
         });
       }
-      dictionary.addToDictionary(word);
+      dictionary.addToDictionary(transformed);
       restartInspections();
     }
   }

spellchecker/testSrc/com/intellij/spellchecker/inspector/AcceptWordAsCorrectTest.java

@@ -0,0 +1,24 @@
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.spellchecker.inspector;
+
+import com.intellij.spellchecker.SpellCheckerManager;
+import com.intellij.testFramework.fixtures.LightPlatformCodeInsightFixtureTestCase;
+
+@SuppressWarnings("SpellCheckingInspection")
+public class AcceptWordAsCorrectTest extends LightPlatformCodeInsightFixtureTestCase {
+
+  private void doTest(String word) {
+    final SpellCheckerManager manager = SpellCheckerManager.getInstance(myFixture.getProject());
+    assertTrue(manager.hasProblem(word));
+    manager.acceptWordAsCorrect(word, myFixture.getProject());
+    assertFalse(manager.hasProblem(word));
+  }
+  
+  public void testGeneral(){
+    doTest("wooord");
+  }
+  
+  public void testCamelCase(){
+    doTest("Tyyyyypo");
+  }
+}