align text layer without rasterising

scripts/helpers.jsx

@@ -46,6 +46,18 @@ function compute_text_layer_dimensions(layer) {
     return dimensions;
 }
 
+function compute_text_layer_bounds(layer) {
+    /**
+     * Return an object with the specified text layer's bounding box.
+     */
+
+    var layer_copy = layer.duplicate(activeDocument, ElementPlacement.INSIDE);
+    layer_copy.rasterize(RasterizeType.TEXTCONTENTS);
+    var layer_bounds = layer_copy.bounds;
+    layer_copy.remove();
+    return layer_bounds;
+}
+
 function select_layer_pixels(layer) {
     /**
      * Select the bounding box of a given layer.

scripts/text_layers.jsx

@@ -63,11 +63,16 @@ function vertically_align_text(layer, reference_layer) {
      * Rasterises a given text layer and centres it vertically with respect to the bounding box of a reference layer.
      */
 
-    layer.rasterize(RasterizeType.TEXTCONTENTS);
+    var layer_copy = layer.duplicate(activeDocument, ElementPlacement.INSIDE);
+    layer_copy.rasterize(RasterizeType.TEXTCONTENTS);
     select_layer_pixels(reference_layer);
-    app.activeDocument.activeLayer = layer;
-    align_vertical(layer);
+    app.activeDocument.activeLayer = layer_copy;
+    align_vertical(layer_copy);
     clear_selection();
+    var layer_dimensions = compute_text_layer_bounds(layer);
+    var layer_copy_dimensions = compute_text_layer_bounds(layer_copy);
+    layer.translate(0, layer_copy_dimensions[1].as("px") - layer_dimensions[1].as("px"));
+    layer_copy.remove();
 }
 
 function vertically_nudge_creature_text(layer, reference_layer, top_reference_layer) {
@@ -276,16 +281,8 @@ var FormattedTextArea = Class({
             // resize the text until it fits into the reference layer
             scale_text_to_fit_reference(this.layer, this.reference_layer);
 
-            // rasterise and centre vertically
+            // centre vertically
             vertically_align_text(this.layer, this.reference_layer);
-
-            if (this.is_centred) {
-                // ensure the layer is centred horizontally as well
-                select_layer_pixels(this.reference_layer);
-                app.activeDocument.activeLayer = this.layer;
-                align_horizontal();
-                clear_selection();
-            }
         }
     }
 });