Add text last-line alignment modes for "Justify Center", "Justify Right", and "Justify All" (#4024)

* feat: Add justify proper alignments(right/left/centre/all)

* chore: fmt

* chore: refactor

* Cleanup

* Fix crash when changing selected layer's alignment from the Text tool control bar

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

node-graph/nodes/text/src/lib.rs

@@ -31,21 +31,37 @@ pub use vector_types;
 #[widget(Radio)]
 pub enum TextAlign {
 	#[default]
-	Left,
-	Center,
-	Right,
-	#[label("Justify")]
+	AlignLeft,
+	AlignCenter,
+	AlignRight,
 	JustifyLeft,
-	// TODO: JustifyCenter, JustifyRight, JustifyAll
+	JustifyCenter,
+	JustifyRight,
+	JustifyAll,
 }
 
 impl From<TextAlign> for parley::Alignment {
 	fn from(val: TextAlign) -> Self {
 		match val {
-			TextAlign::Left => parley::Alignment::Left,
-			TextAlign::Center => parley::Alignment::Center,
-			TextAlign::Right => parley::Alignment::Right,
-			TextAlign::JustifyLeft => parley::Alignment::Justify,
+			TextAlign::AlignLeft => parley::Alignment::Left,
+			TextAlign::AlignCenter => parley::Alignment::Center,
+			TextAlign::AlignRight => parley::Alignment::Right,
+			_ => parley::Alignment::Justify,
+		}
+	}
+}
+
+impl TextAlign {
+	/// What `parley::Alignment` to apply as a post-correction to the last line of a paragraph, or `None` if parley's default already handles it.
+	///
+	/// `JustifyLeft` returns `None` because parley already left-aligns the last line of a `Justify` layout. The other justify modes need
+	/// the last line shifted (`Center`/`Right`) or its inter-word spaces redistributed (`Justify` / `JustifyAll`).
+	pub fn last_line_correction(self) -> Option<parley::Alignment> {
+		match self {
+			Self::JustifyCenter => Some(parley::Alignment::Center),
+			Self::JustifyRight => Some(parley::Alignment::Right),
+			Self::JustifyAll => Some(parley::Alignment::Justify),
+			_ => None,
 		}
 	}
 }