GetContent() width does not match what is rendered for emoji flags #793
Description
For some emojis (at least flags), the width reported from tcell.GetContent() does not match what is shown on screen. The flags takes up 2 horizontal cells on screen, but the width returned is always 1.
I did some testing and found that mattn/go-runewidth also reports these as having width 1, however rivo/uniseg does correctly report the width of these flags as 2 if converted to a grapheme cluster.
Below is a short program demonstrating this:
package main
import (
"fmt"
tcell "github.com/gdamore/tcell/v2"
"time"
)
func main() {
screen, err := tcell.NewScreen()
defer screen.Fini()
if err != nil {
panic(err)
}
if err = screen.Init(); err != nil {
panic(err)
}
// sets character 🇩🇪
screen.SetContent(1, 0, rune(127465), []rune{rune(127466)}, tcell.StyleDefault)
_, _, _, width := screen.GetContent(1, 0)
fmt.Printf("width of 🇩🇪: %v\n", width)
// sets character 🏳️🌈
screen.SetContent(2, 0, rune(127987), []rune{rune(65039), rune(8205), rune(127752)}, tcell.StyleDefault)
_, _, _, width = screen.GetContent(2, 0)
fmt.Printf("width of 🏳️🌈: %v\n", width)
screen.Show()
time.Sleep(time.Second * 5)
}The screen shows the two flags spanning 2 columns each in both ghostty and kitty on my mac m2, but the printed output is:
width of 🇩🇪: 1
width of 🏳️🌈: 1