Steps to Reproduce

1. import https://tracker.zkoss.org/secure/attachment/26861/26861_keikai-710-2.xlsx with 6.0.0.FL.20240320-Eval
2. hide column H
3. select J2
4. click the filter dropdown

Current Result

the filter popup doesn't open

Expected Result

the filter popup should open

Debug Information

• if you don't select the cell J2 first, just directly click the filter dropdown , the filter popup can open
• you can not open all columns with a filter on the right panel, if you select the header cell with a filter dropdown first

Workaround

• don't select the cell with the dropdown before opening the filter popup