Hope to load more than one font resources into theme, for supporting various kind of chars, like an font family could do

[ZSA233]

Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

I couldn't load both lucon.ttf(only support latin char) font and simli.ttf(support simple chineses char) font to implement "lucon.ttf" latin-style(more priolity) and simple chineses char(except latin char)

Is it possible to construct a solution with the existing API?

No response

Describe the solution you'd like to see.

f1 = loadMeasureFont(theme.TextFont())
f2 = loadMeasureFont(theme.DefaultTextFont())

painter.CachedFontFace only load costom theme font resource(f1) and built-in font resource(f2).

Is it possible to load font family resource like this

type MyTheme struct {
	fyne.Theme
}

func (m *MyTheme) FontFamily(ts fyne.TextStyle) []fyne.Resource {
	return []fyne.Resource{
		assets.FontResource,
		assets.FontResource1,
	}
}

painter.CachedFontFace impl could be like

for _, f := range theme.TextFontFamily() {
	faces = append(faces, loadMeasureFont(f))
}

[andydotxyz]

Internally this will be in place for 2.5 to look up system fonts.
Maybe test develop branch and see if this is still needed?

[ZSA233]

Internally this will be in place for 2.5 to look up system fonts. Maybe test develop branch and see if this is still needed?

@v2.4.6: It works for me with lang char, and it really looks more intuitive for looking up system fonts.