Hitting cancel on Text Colour threshold dialog box doesn't restore group-specific settings

The 'Text Colour' settings (two colours, threshold for switching between according to box colour) can be set per group and for the whole view. When apply to all groups is ticked, opening the text colour dialog allows group specific settings to be adjusted.

Hitting cancel doesn't revert these settings so individual group text settings are then lost. Instead, each group's settings should be restored.

Probably occurs in all versions of Jalview 2.