EA-108926 - assert: TextRange.<init>

fix another case when invalidated folding region is not removed from group

platform/platform-impl/src/com/intellij/openapi/editor/impl/FoldingModelImpl.java

@@ -723,6 +723,7 @@ public class FoldingModelImpl extends InlayModel.SimpleAdapter
           FoldRegionImpl otherRegion = getRegion(otherNode);
           if (otherRegion.mySizeBeforeUpdate > region.mySizeBeforeUpdate) {
             setNode(region, null);
+            removeRegionFromGroup(region);
             removeIntervalInternal(0);
             super.addIntervalsFrom(otherNode);
           }

platform/platform-tests/testSrc/com/intellij/openapi/editor/impl/FoldingTest.java

@@ -398,4 +398,18 @@ public class FoldingTest extends AbstractEditorTest {
     FoldRegion region = addFoldRegion(0, 0, ".");
     assertNull(region);
   }
+
+  public void testRegionBecomingInvalidIsRemovedFromGroup() {
+    FoldingGroup group = FoldingGroup.newGroup("test");
+
+    myEditor.getFoldingModel().runBatchFoldingOperation(
+      () -> myModel.createFoldRegion(0, 10, "...", group, false)
+    );
+    addCollapsedFoldRegion(1, 10, "...");
+
+    WriteCommandAction.runWriteCommandAction(getProject(), () -> myEditor.getDocument().deleteString(0, 1));
+
+    List<FoldRegion> regions = myModel.getGroupedRegions(group);
+    assertEmpty(regions);
+  }
 }