IDEA-58117 Pressing 'End' after the end of line should go to the end of line in case of the plain text document

Don't stop 'end' processing if formatting is not defined for particular type of document

platform/lang-impl/src/com/intellij/codeInsight/editorActions/EndHandler.java

@@ -30,6 +30,8 @@ import com.intellij.psi.PsiFile;
 import com.intellij.psi.codeStyle.CodeStyleManager;
 import com.intellij.util.text.CharArrayUtil;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 public class EndHandler extends EditorActionHandler {
   private final EditorActionHandler myOriginalHandler;
 
@@ -67,12 +69,18 @@ public class EndHandler extends EditorActionHandler {
     final int caretOffset = caretModel.getOffset();
     CharSequence chars = editor.getDocument().getCharsSequence();
     int length = editor.getDocument().getTextLength();
+
     if (caretOffset < length){
       final int offset1 = CharArrayUtil.shiftBackward(chars, caretOffset - 1, " \t");
       if (offset1 < 0 || chars.charAt(offset1) == '\n' || chars.charAt(offset1) == '\r'){
         int offset2 = CharArrayUtil.shiftForward(chars, offset1 + 1, " \t");
         boolean isEmptyLine = offset2 >= length || chars.charAt(offset2) == '\n' || chars.charAt(offset2) == '\r';
-        if (isEmptyLine){
+        if (isEmptyLine) {
+
+          // There is a possible case that indent string is not calculated for particular document (that is true at least for plain text
+          // documents). Hence, we check that and don't finish processing in case we have such a situation. AtomicBoolean is used
+          // here just as a boolean value holder due to requirement to declare variable used from inner class as final.
+          final AtomicBoolean stopProcessing = new AtomicBoolean(true);
           PsiDocumentManager.getInstance(project).commitAllDocuments();
           ApplicationManager.getApplication().runWriteAction(new Runnable() {
             public void run() {
@@ -91,6 +99,9 @@ public class EndHandler extends EditorActionHandler {
                   EditorModificationUtil.insertStringAtCaret(editor, lineIndent);
                 }
               }
+              else {
+                stopProcessing.set(false);
+              }
 
               editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
               editor.getSelectionModel().removeSelection();
@@ -105,7 +116,9 @@ public class EndHandler extends EditorActionHandler {
               return result;
             }
           });
-          return;
+          if (stopProcessing.get()) {
+            return;
+          }
         }
       }
     }