Describe the bug

The CSI I and CSI O terminal sequences are wrongly listed in the output of :set termcap.

To Reproduce

Run this shell command:

vim -Nu NONE +'set termcap'

Notice that the sequences ^[[I and ^[[O are at the end of the "Terminal keys" section. And they're not mapped to any Vim keycode.

Expected behavior

I'm not sure, but either of these 2 statements should be true:

• ^[[I and ^[[O are not listed in :set termcap, at all
• ^[[I and ^[[O are listed in :set termcap, but they are prefixed with a Vim pseudo-key, like <FocusGain> and <FocusLost>

Rationale: They are the only sequences which are not mapped to any Vim key or pseudo-key, which is inconsistent.

Environment

• Vim version: 8.2 Included patches: 1-2380
• OS: Ubuntu 16.04.7 LTS
• Terminal: xterm(363)

Additional context

These sequences started to appear in 8.2.2345, when FocusGain and FocusLost were introduced.