[gnome-shell] authPrompt: Fix spinner alignment

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit b191e9ef9125b3e292b60a5db338f11a75794cc8
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Apr 13 18:55:34 2020 +0200

    authPrompt: Fix spinner alignment
    
    We want the spinner to be centered with regard to the entry, but
    constraining the height breaks that:
    
     1. clutter_actor_allocate() is called with the available size
     2. clutter_actor_update_constraints() then adjusts that according
        to the constraints
     3. clutter_actor_adjust_allocation() applies the margin/expand/align
        properties.
    
    The issue there is that 2. reduces the allocation to the desired size,
    so there is no more extra space to distribute in 3.
    
    We can fix this by either constraining everything (and rely on the
    cancel button's alignment) or limit the constraint to the width. The
    latter seems more appropriate, given that the constraint is only used
    to center the entry horizontally.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2628

 js/gdm/authPrompt.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/gdm/authPrompt.js b/js/gdm/authPrompt.js
index 3434de0cf0..c26b1bcad5 100644
--- a/js/gdm/authPrompt.js
+++ b/js/gdm/authPrompt.js
@@ -184,7 +184,7 @@ var AuthPrompt = GObject.registerClass({
         });
         this._defaultButtonWell.add_constraint(new Clutter.BindConstraint({
             source: this.cancelButton,
-            coordinate: Clutter.BindCoordinate.SIZE,
+            coordinate: Clutter.BindCoordinate.WIDTH,
         }));
         this._mainBox.add_child(this._defaultButtonWell);