Function wrapForScrollback

internal/tui/render.go:48–64

wrapForScrollback hard-wraps every line of s to the terminal width before it goes to tea.Println. bubbletea's standard renderer dumps queued Println lines verbatim - unlike its View paint path it never truncates them - so a line wider than the terminal is soft-wrapped by the terminal into extra phys

(s string, width int)

// wider than the terminal is soft-wrapped by the terminal into extra physical
// rows the renderer never counted. Its cursor math then drifts and the prior
// frame's wrapped textarea rows survive un-erased: the duplicated prompt
// fragment seen when submitting a long prompt. Mirrors the ansi.Wrap the live
// streaming view already applies. width <= 0 (no WindowSizeMsg yet) is a no-op.
func wrapForScrollback(s string, width int) string {
	if width <= 0 {
		return s
	}
	// Terminals advance a literal tab to the next 8-column stop, but ansi.Wrap
	// counts it as one cell, so a tab-bearing line (glamour preserves tabs
	// inside code fences; a user echo can carry pasted ones) passes the width
	// check yet physically overflows - the exact drift this wrap exists to
	// prevent. Expand before counting; \t never occurs inside an ANSI escape
	// sequence, so a plain replace is safe on styled strings.
	s = strings.ReplaceAll(s, "\t", "    ")
	lines := strings.Split(s, "\n")
	for i, line := range lines {
		lines[i] = ansi.Wrap(line, width, "")
	}
	return strings.Join(lines, "\n")
}