[gnome-shell/gnome-3-36] authPrompt: Fix spinner alignment

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

commit 18a5c7436251d43d458c40a0259dc6da4d9ea760
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Apr 13 16:55:34 2020 +0000

    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
    
    
    (cherry picked from commit b191e9ef9125b3e292b60a5db338f11a75794cc8)

 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);