Describe the feature

Focus frames are often used for tracking spells to interrupt. Would be great if there was a way to distinguish in the cast bar of the focus frame which spells can or cannot be interrupted so you don't waste an interrupt for nothing.
In the UI options of the focus frame there could be a dropdownlist with options such as:

• Show all casts (by default)
• Only show interruptable casts
• Highlight interruptable casts (so its easy to distinguish between the ones that can and those that can't be interrupted.

Describe the implementation

Described above everything :)

I like this idea. Will look into this once I get around to doing the already planned Cast Bar optimizations.

Highlight interruptable casts (so its easy to distinguish between the ones that can and those that can't be interrupted.

This part however I'm a bit unsure what you mean, since you can already change the color of the Cast Bar based on if the cast is interruptible or not.

I like this idea. Will look into this once I get around to doing the already planned Cast Bar optimizations.

Highlight interruptable casts (so its easy to distinguish between the ones that can and those that can't be interrupted.

This part however I'm a bit unsure what you mean, since you can already change the color of the Cast Bar based on if the cast is interruptible or not.

You're correct, found out that that part exists already after already posting.