insert paired end instead of shorthand if needed

#IDEA-157251 fixed

xml/impl/src/com/intellij/codeInsight/completion/XmlSmartEnterProcessor.java

@@ -28,6 +28,7 @@ import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.psi.xml.*;
 import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.text.CharArrayUtil;
+import com.intellij.xml.util.CheckEmptyTagInspection;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -123,7 +124,7 @@ public class XmlSmartEnterProcessor extends SmartEnterProcessor {
           final CharSequence text2insert = getClosingPart(xmlAttribute, tagAtCaret, true);
 
           doc.insertString(insertionOffset, text2insert);
-          caretTo = insertionOffset + text2insert.length();
+          caretTo = insertionOffset + (text2insert.length() > 2 ? 1 : text2insert.length());
         }
 
         commitChanges(project, editor, psiFile, caretTo, null);
@@ -199,7 +200,10 @@ public class XmlSmartEnterProcessor extends SmartEnterProcessor {
   }
 
   protected String getClosingPart(final XmlAttribute xmlAttribute, final XmlTag tagAtCaret, final boolean emptyTag) {
-    return getClosingQuote(xmlAttribute) + (emptyTag ? "/>" : ">");
+    return getClosingQuote(xmlAttribute) +
+           (emptyTag ?
+              CheckEmptyTagInspection.isTagWithEmptyEndNotAllowed(tagAtCaret) ? "></" + tagAtCaret.getName() + ">"  : "/>" :
+              ">");
   }
 
   @NotNull

xml/tests/src/com/intellij/codeInsight/completion/XmlSmartEnterTest.java

@@ -104,6 +104,11 @@ public class XmlSmartEnterTest extends LightCodeInsightTestCase {
     _doTest("idea103417_2.xml", "idea103417_2_after.xml");
   }
 
+  public void testEmptyHtml() throws Exception {
+    _doTestCompletion("EmptyHtml.html", "EmptyHtml_after.html");
+    _doTestCompletion("EmptyHtml2.html", "EmptyHtml2_after.html");
+  }
+
   private void _doTestCompletion(final String name, final String after_name) throws Exception {
     configureByFile(BASE_PATH + "/" + name);
     performCompletionAction();

xml/tests/testData/smartEnter/EmptyHtml.html

@@ -0,0 +1 @@
+<tab<caret>

xml/tests/testData/smartEnter/EmptyHtml2.html

@@ -0,0 +1 @@
+<br<caret>

xml/tests/testData/smartEnter/EmptyHtml2_after.html

@@ -0,0 +1 @@
+<br/><caret>

xml/tests/testData/smartEnter/EmptyHtml_after.html

@@ -0,0 +1 @@
+<table><caret></table>

xml/xml-analysis-impl/src/com/intellij/xml/util/CheckEmptyTagInspection.java

@@ -77,7 +77,7 @@ public class CheckEmptyTagInspection extends XmlSuppressableInspectionTool {
     };
   }
 
-  static boolean isTagWithEmptyEndNotAllowed(final XmlTag tag) {
+  public static boolean isTagWithEmptyEndNotAllowed(final XmlTag tag) {
     String tagName = tag.getName();
     if (tag instanceof HtmlTag) tagName = tagName.toLowerCase();