Vertical AutoMerge keeps unnecessary whitespace when a merged row value is wrapped by WidthMax

[michaelmdresser]

Describe the bug When using AutoMerge and WidthMax together on a ColumnConfig, unnecessary whitespace is left in rows where the column value is wrapped and has been merged.

To Reproduce

import (
	"fmt"
	"testing"

	"github.com/jedib0t/go-pretty/v6/table"
	"github.com/jedib0t/go-pretty/v6/text"
)

func TestWrapWithVerticalMerge(t *testing.T) {
	tbl := table.NewWriter()

	tbl.SetColumnConfigs([]table.ColumnConfig{
		{
			Name:             "C1",
			AutoMerge:        true,
			WidthMax:         10,
			WidthMaxEnforcer: text.WrapSoft,
		},
		{
			Name: "C2",
		},
	})

	tbl.AppendHeader(table.Row{
		"C1",
		"C2",
	})

	tbl.AppendRows([]table.Row{
		{
			"very long row value that wraps",
			"x",
		},
		{
			"very long row value that wraps",
			"y",
		},
	})

	tblstring := tbl.Render()
	fmt.Println(tblstring)
}

Output:

=== RUN   TestWrapWithVerticalMerge
+------------+----+
| C1         | C2 |
+------------+----+
| very long  | x  |
| row value  |    |
| that wraps |    |
|            | y  |
|            |    |
|            |    |
+------------+----+

Expected behavior I would expect the output to look more like the following, though I'm open to changes on the specifics. The main point is that, similar to https://github.com/jedib0t/go-pretty/issues/226, unnecessary space is left because it seems like the merging thinks the original row value (pre merge) is still present.

+------------+----+
| C1         | C2 |
+------------+----+
| very long  | x  |
| row value  | y  |
| that wraps |    |
+------------+----+

Software (please complete the following information):

My go.mod has:

go 1.16

require (
	github.com/jedib0t/go-pretty/v6 v6.4.6
)

• OS: Linux
• GoLang Version: go version go1.20.1 linux/amd64