1. open zss.test/display2003.zul, sheet ""cell-text"", select B5:J7
2. apply right upper corner background color (#6600ff)
3. apply white background color (#fffff)
4. apply #0000ff (left upper corner, the sixth color)

Expected:
The background color of all selected cells changes to #0000ff

Actual:
only part of cells change its background color.