DECRPM: missing dynamic mode reports for cursor blink and save cursor

[ona-automations]

Problem

requestMode (CSI ? $ p) returns NOT_RECOGNIZED (Pm=0) for DEC private modes 12 (cursor blink) and 1048 (save cursor) that upstream xterm.js reports with dynamic values.

Mode	Type	Upstream Response	Go Port Response
12 (att610 cursor blink)	DEC private	SET/RESET based on cursorBlink option	NOT_RECOGNIZED (0)
1048 (save cursor)	DEC private	SET (1) always	NOT_RECOGNIZED (0)

Reproduction

term := xterm.New(xterm.WithCols(80), xterm.WithRows(24))
defer term.Dispose()
var resp string
term.OnData(func(data string) { resp += data })

// DEC private mode 12 — should respond based on cursorBlink option
term.WriteString("\x1b[?12$p")
// Got: "\x1b[?12;0$y" (NOT_RECOGNIZED)
// Want: "\x1b[?12;2$y" (RESET, since cursorBlink defaults to false)

// DEC private mode 1048 — should always respond SET
term.WriteString("\x1b[?1048$p")
// Got: "\x1b[?1048;0$y" (NOT_RECOGNIZED)
// Want: "\x1b[?1048;1$y" (SET)

Fix

In inputhandler_csi.go, add cases to privateModeSetting:

case 12:
    return boolToPm(h.optionsService.Options.CursorBlink)
case 1048:
    return 1 // always SET per xterm behavior

Upstream Reference

• File: src/common/InputHandler.ts, method requestMode, lines 2330–2395
• Commit: 6ba731d73bfbe074e84b57abb62080bed2f4db03