[gnome-shell] power: Use more fine-grained battery levels

[Florian Müllner <fmuellner src gnome org>]

commit bd18313d125aa1873c21b9cce9bbf81a335e48b0
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue May 28 17:56:36 2019 +0000

    power: Use more fine-grained battery levels
    
    Adwaita-icon-theme added new battery icons which represent battery levels
    in 10% steps[0]. Use these if they are available, otherwise fall back to
    the existing icon names for compatibility with older icon themes.
    
    [0] https://gitlab.gnome.org/GNOME/adwaita-icon-theme/issues/6
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/561

 js/ui/status/power.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/status/power.js b/js/ui/status/power.js
index cd1c01d86..8ffb0c631 100644
--- a/js/ui/status/power.js
+++ b/js/ui/status/power.js
@@ -107,10 +107,20 @@ var Indicator = class extends PanelMenu.SystemIndicator {
         }
 
         // The icons
-        let icon = this._proxy.IconName;
+        let chargingState = this._proxy.State == UPower.DeviceState.CHARGING
+            ? '-charging' : '';
+        let fillLevel = 10 * Math.floor(this._proxy.Percentage / 10);
+        let icon = this._proxy.State == UPower.DeviceState.FULLY_CHARGED
+            ? 'battery-level-100-charged-symbolic'
+            : `battery-level-${fillLevel}${chargingState}-symbolic`;
+
         this._indicator.icon_name = icon;
         this._item.icon.icon_name = icon;
 
+        let fallbackIcon = this._proxy.IconName;
+        this._indicator.fallback_icon_name = fallbackIcon;
+        this._item.icon.fallback_icon_name = fallbackIcon;
+
         // The icon label
         let label;
         if (this._proxy.State == UPower.DeviceState.FULLY_CHARGED)