Add a 'Preserve Aspect Ratio' checkbox to Properties panel (#923)

* Add the link button

* Transform around pivot

* Remove log

* Fix tests

* Add a hacky two-line layout for the checkbox

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

document-legacy/src/document.rs

@@ -628,6 +628,12 @@ impl Document {
 				}
 				Some(vec![LayerChanged { path: layer_path.clone() }])
 			}
+			Operation::SetLayerPreserveAspect { layer_path, preserve_aspect } => {
+				if let Ok(layer) = self.layer_mut(&layer_path) {
+					layer.preserve_aspect = preserve_aspect;
+				}
+				Some(vec![LayerChanged { path: layer_path.clone() }])
+			}
 			Operation::SetTextEditability { path, editable } => {
 				self.layer_mut(&path)?.as_text_mut()?.editable = editable;
 				self.mark_as_dirty(&path)?;

document-legacy/src/layers/layer_info.rs

@@ -227,6 +227,9 @@ pub struct Layer {
 	/// A transformation applied to the layer (translation, rotation, scaling, and shear).
 	#[serde(with = "DAffine2Ref")]
 	pub transform: glam::DAffine2,
+	/// Should the aspect ratio of this layer be preserved?
+	#[serde(default = "return_true")]
+	pub preserve_aspect: bool,
 	/// The center of transformations like rotation or scaling with the shift key.
 	/// This is in local space (so the layer's transform should be applied).
 	pub pivot: DVec2,
@@ -255,6 +258,7 @@ impl Layer {
 			name: None,
 			data,
 			transform: glam::DAffine2::from_cols_array(&transform),
+			preserve_aspect: true,
 			pivot: DVec2::splat(0.5),
 			cache: String::new(),
 			thumbnail_cache: String::new(),
@@ -515,6 +519,7 @@ impl Clone for Layer {
 			name: self.name.clone(),
 			data: self.data.clone(),
 			transform: self.transform,
+			preserve_aspect: self.preserve_aspect,
 			pivot: self.pivot,
 			cache: String::new(),
 			thumbnail_cache: String::new(),

document-legacy/src/operation.rs

@@ -245,6 +245,10 @@ pub enum Operation {
 		path: Vec<LayerId>,
 		name: String,
 	},
+	SetLayerPreserveAspect {
+		layer_path: Vec<LayerId>,
+		preserve_aspect: bool,
+	},
 	SetLayerBlendMode {
 		path: Vec<LayerId>,
 		blend_mode: BlendMode,