Steps to Reproduce

run the attached file

Current Result

the cells A6 B6 are incorrectly styled with their conditional styling even though the match-formula referencing a non existing sheet fails to evaluate

Expected Result

the conditional styles should not apply in case of formula errors

Debug Info

This only happens with negative operators
"Not Equal", "Not Contains", "Greater Than Or Equal", "Less Than Or Equal"

Root Cause

the negation is applied after the formula evaluation - negating also errors results into "true" leading to styles being applied in case of errors

https://github.com/zkoss/zkspreadsheet/blob/3.9.1/zssmodel/src/org/zkoss/zss/range/impl/CellMatch2.java#L100-L101