Fix #37036, pack and refresh button not aligned anymore. Also add

operator for opening images in the image editor header, it's easily one
of the most common operations, don't see why it has to be only accessed
from menu.

release/scripts/startup/bl_ui/space_image.py

@@ -390,7 +390,7 @@ class IMAGE_HT_header(Header):
             if show_maskedit:
                 sub.menu("MASK_MT_mask")
 
-        layout.template_ID(sima, "image", new="image.new")
+        layout.template_ID(sima, "image", new="image.new", open="image.open")
         if not show_render:
             layout.prop(sima, "use_image_pin", text="")