Horizontal text alignment + text wrap truncation

**Is your feature request related to a problem? Please describe.**
Currently, I have this code
```rust
ui.label(egui::text::LayoutJob {
sections: vec![egui::text::LayoutSection {
leading_space: 0.0,
byte_range: 0..path.len(),
format: egui::TextFormat::simple(egui::FontId::default(), color),
}],
wrap: egui::epaint::text::TextWrapping {
max_rows: 1,
break_anywhere: true,
..Default::default()
},
break_on_newline: false,
halign: egui::Align::RIGHT,
justify: true,
text: path,
..Default::default()
});
```

This renders:


But I was expecting for the ellipsis to show on the LEFT, not the right.

**Describe the solution you'd like**
My use case is showing a bunch of file paths. These aren't very useful when the end of them are cut off, as a bunch of files with the same prefix will just look like the same path.

Thank you :D