Glowing Action Buttons (GABs) could be selected individually when there are at least 2 different spells glowing simultaneously.

These options would be set in the Interface > AddOns > SpellActivationOverlay panel, with a new subcategory for each class.

Options would be suggested for:

• all existing "auras" with 2 or more GABs
• all non-official auras which have 2 or more GABs (e.g. Druid's Omen of Clarity)
• existing auras which could have GABs but GABs were omitted to avoid the "Xmas effect" (e.g. Shaman's Maelstrom Weapon)

This issue is the GAB counterpart of the SAO evolution described in #69.

The functionality will be implemented as follows:

• all GABs will have an option to enable/disable them, not only GABs in a auras with 2+ GABs
• for clarity and and performance reasons, the player will be able to enable/disable effects for his/her class only
• consequently, there won't be a new panel per class, all GABs will be configurable in the main addon panel
  • GABs will be checkboxes listed under the "Glowing Buttons" checkbox
  • checkbox names will be prefixed by the class name, emphasizing that options are tied to the current class
  • checking/unchecking "Glowing Buttons" will enable/disable GAB checkboxes
• clicking the "Defaults" button will only reset settings for the current class, not for "invisible" classes

Implemented in #87 according to the above comment.