Rewrote Table to accommodate virtual tables.

demos/table/virtualtable/README.md

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+![Screenshot](screenshot.png)

demos/table/virtualtable/main.go

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+package main
+
+import (
+	"fmt"
+	"math"
+
+	"github.com/rivo/tview"
+)
+
+type TableData struct {
+	tview.TableContentReadOnly
+}
+
+func (d *TableData) GetCell(row, column int) *tview.TableCell {
+	letters := [...]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 'A' + byte(row%26)} // log(math.MaxInt64) / log(26) ~= 14
+	start := len(letters) - 1
+	row /= 26
+	for row > 0 {
+		start--
+		row--
+		letters[start] = 'A' + byte(row%26)
+		row /= 26
+	}
+	return tview.NewTableCell(fmt.Sprintf("[red]%s[green]%d", letters[start:], column))
+}
+
+func (d *TableData) GetRowCount() int {
+	return math.MaxInt64
+}
+
+func (d *TableData) GetColumnCount() int {
+	return math.MaxInt64
+}
+
+func main() {
+	data := &TableData{}
+	table := tview.NewTable().
+		SetBorders(false).
+		SetSelectable(true, true).
+		SetContent(data)
+	if err := tview.NewApplication().SetRoot(table, true).EnableMouse(true).Run(); err != nil {
+		panic(err)
+	}
+}