Function TestTypingPreservesEarlyContent

internal/tui/prompt_typing_test.go:33–43

TestTypingPreservesEarlyContent: a marker at the START of a line that wraps to many rows must stay visible in the textarea View. Guards a scroll bug: textarea's repositionView scrolls down when the cursor crosses below its Height; recomputeLayout grew Height *after* that scroll, leaving the marker'

(t *testing.T)

// preGrowTextarea inflates first so the cursor stays in view and
// repositionView never scrolls.
func TestTypingPreservesEarlyContent(t *testing.T) {
	m := newTestModel(t, func(http.ResponseWriter, *http.Request) {})
	final := typeChars(tea.Model(m), "ZZZSTART"+strings.Repeat("a", 300))
	mm := final.(Model)
	view := mm.ta.View()
	if !strings.Contains(view, "ZZZSTART") {
		t.Fatalf("first chars typed are not visible - viewport scrolled past them.\n"+
			"ta height=%d visualLines=%d width=%d\nView:\n%s",
			mm.ta.Height(), mm.visualPromptLines(), mm.width, view)
	}
}

// TestTypingOverflowKeepsCursorVisible: once content overflows
// maxTextareaHeight, pre-grow must NOT pin the viewport to the top: that