Grey flicker if sort column hidden

[Timwi]

This bug is cosmetic and does not occur often, but here is a precise bugreport.

Sort by the last column (by clicking the column header). The column is highlighted in grey.

Then right-click the column and choose its name in the menu. This hides the column.

Now let µTorrent run for a while. The window area will occasionally flicker back and forth between grey and white.

The flickering stops if you sort again by a column that is visible.