Bug 750953 - The Curves dialog should present per channel lines...
...when opened by the "Edit these settings as Curves" button on the Levels dialog The code to configure the entire GUI correctly was not even called when initially creating the curves dialog (the color bars probably looked right just because of default values of their own). Factor out gimp_curves_tool_update_channel() which properly updates the GUI. Call it after the dialog has been created, and when the active channel changes.
Showing with 74 additions and 66 deletions