When '.' is typed on a new line, automatically adjust line indent for a chained call (solves IDEA-255648)

GitOrigin-RevId: 21315bb550bacc92cd2958c505eb0b5a989ee858

java/java-impl/src/com/intellij/codeInsight/editorActions/JavaTypedHandler.java

@@ -366,9 +366,29 @@ public class JavaTypedHandler extends TypedHandlerDelegate {
     else if (c == ',' && handleAnnotationParameter(project, editor, file)) {
       return Result.STOP;
     }
+    else if (c == '.') {
+      if (handleDotTyped(project, editor, file)) {
+        return Result.STOP;
+      }
+    }
     return Result.CONTINUE;
   }
 
+  private static boolean handleDotTyped(@NotNull Project project, @NotNull Editor editor, @NotNull PsiFile file) {
+    int offset = editor.getCaretModel().getOffset() - 1;
+    if (offset >= 0) {
+      Document document = editor.getDocument();
+      int line = document.getLineNumber(offset);
+      int lineStart = document.getLineStartOffset(line);
+      if (StringUtil.isEmptyOrSpaces(document.getCharsSequence().subSequence(lineStart, offset))) {
+        PsiDocumentManager.getInstance(project).commitDocument(editor.getDocument());
+        CodeStyleManager.getInstance(project).adjustLineIndent(file, offset);
+        return true;
+      }
+    }
+    return false;
+  }
+
   private static boolean handleAnnotationParameter(Project project, @NotNull Editor editor, @NotNull PsiFile file) {
     int caret = editor.getCaretModel().getOffset();
     if (mightBeInsideDefaultAnnotationAttribute(editor, caret - 2)) {

java/java-tests/testData/codeInsight/typing/dotOnNewLine_after.java

@@ -0,0 +1,9 @@
+public class Test {
+    void foo1() {
+        foo(
+                strings
+                        .stream()
+                        .<caret>
+        );
+  }
+}

java/java-tests/testData/codeInsight/typing/dotOnNewLine_before.java

@@ -0,0 +1,9 @@
+public class Test {
+    void foo1() {
+        foo(
+                strings
+                        .stream()
+                <caret>
+        );
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/JavaTypingTest.java

@@ -152,6 +152,8 @@ public class JavaTypingTest extends BasePlatformTestCase {
 
   public void testEqualAfterBitwiseOp() { doTest('='); }
 
+  public void testDotOnNewLine() { doTest('.'); }
+
   public void testEqualAfterBitwiseOp2() {
     myFixture.configureByFile(getTestName(true) + "_before.java");
     CommonCodeStyleSettings settings = CodeStyle.getLanguageSettings(myFixture.getFile());