Use getters to lazy-load cleanEdge and OmniScale shaders

src/Autoload/DrawingAlgos.gd

@@ -4,8 +4,16 @@ enum GradientDirection { TOP, BOTTOM, LEFT, RIGHT }
 ## Continuation from Image.Interpolation
 enum Interpolation { SCALE3X = 5, CLEANEDGE = 6, OMNISCALE = 7 }
 var blend_layers_shader := preload("res://src/Shaders/BlendLayers.gdshader")
-var clean_edge_shader: Shader
-var omniscale_shader := preload("res://src/Shaders/Effects/Rotation/OmniScale.gdshader")
+var clean_edge_shader: Shader:
+	get:
+		if clean_edge_shader == null:
+			clean_edge_shader = load("res://src/Shaders/Effects/Rotation/cleanEdge.gdshader")
+		return clean_edge_shader
+var omniscale_shader: Shader:
+	get:
+		if omniscale_shader == null:
+			omniscale_shader = load("res://src/Shaders/Effects/Rotation/OmniScale.gdshader")
+		return omniscale_shader
 
 
 ## Blends canvas layers into passed image starting from the origin position

src/UI/Dialogs/ImageEffects/RotateImage.gd

@@ -33,10 +33,6 @@ func _ready() -> void:
 
 
 func _about_to_popup() -> void:
-	if DrawingAlgos.clean_edge_shader == null:
-		DrawingAlgos.clean_edge_shader = load(
-			"res://src/Shaders/Effects/Rotation/cleanEdge.gdshader"
-		)
 	drag_pivot = false
 	if pivot == Vector2.INF:
 		_calculate_pivot()

src/UI/Dialogs/ImageEffects/ScaleImage.gd

@@ -22,10 +22,6 @@ func _ready() -> void:
 
 
 func _on_ScaleImage_about_to_show() -> void:
-	if DrawingAlgos.clean_edge_shader == null:
-		DrawingAlgos.clean_edge_shader = load(
-			"res://src/Shaders/Effects/Rotation/cleanEdge.gdshader"
-		)
 	Global.canvas.selection.transform_content_confirm()
 	aspect_ratio = float(Global.current_project.size.x) / float(Global.current_project.size.y)
 	width_value.value = Global.current_project.size.x