IDEA-131953 Multiple carets misbehave when auto completion dropdown opens

java/java-tests/testSrc/com/intellij/codeInsight/completion/JavaAutoPopupTest.groovy

@@ -650,6 +650,47 @@ public interface Test {
     assert !lookup
   }
 
+  public void testMulticaretLeftRightMovements() {
+    myFixture.configureByText("a.java", """
+      class Foo {
+        void foo(String iterable) {
+          <caret>ter   x
+          <caret>ter   x
+        }
+      }
+    """)
+    type('i')
+    assert lookup
+
+    edt { myFixture.performEditorAction(IdeActions.ACTION_EDITOR_MOVE_CARET_RIGHT) }
+    myFixture.checkResult """
+      class Foo {
+        void foo(String iterable) {
+          it<caret>er   x
+          it<caret>er   x
+        }
+      }
+    """
+    joinAutopopup()
+    joinCompletion()
+    assert lookup
+    assert !lookup.calculating
+
+    edt { myFixture.performEditorAction(IdeActions.ACTION_EDITOR_MOVE_CARET_LEFT) }
+    myFixture.checkResult """
+      class Foo {
+        void foo(String iterable) {
+          i<caret>ter   x
+          i<caret>ter   x
+        }
+      }
+    """
+    joinAutopopup()
+    joinCompletion()
+    assert lookup
+    assert !lookup.calculating
+  }
+
   public void testTypingInAnotherEditor() {
     myFixture.configureByText("a.java", "")
     type 'c'