authentication: Enable StEntry busy indicators in the screensaver

and polkit dialogs.

The network auth one does not require it, as it does not stick
around waiting for an outcome. If authentication fails there, it
shows a new dialog.

The keyring prompt doesn't seem to last long enough to need this
sort of visual - it immediately returns.

Author: mtwebster

js/ui/polkitAuthenticationAgent.js

@@ -389,6 +389,7 @@ var AuthenticationDialog = GObject.registerClass({
     }
 
     _onEntryActivate() {
+        this._passwordEntry.start_busy();
         let response = this._passwordEntry.get_text();
         if (response.length === 0)
             return;
@@ -409,6 +410,8 @@ var AuthenticationDialog = GObject.registerClass({
     }
 
     _onSessionCompleted(session, gainedAuthorization) {
+        this._passwordEntry.end_busy();
+
         if (this._completed || this._doneEmitted)
             return;
 
@@ -466,6 +469,7 @@ var AuthenticationDialog = GObject.registerClass({
     }
 
     _onSessionShowError(session, text) {
+        this._passwordEntry.end_busy();
         this._passwordEntry.set_text('');
         this._errorMessageLabel.set_text(text);
         this._errorMessageLabel.show();
@@ -475,6 +479,7 @@ var AuthenticationDialog = GObject.registerClass({
     }
 
     _onSessionShowInfo(session, text) {
+        this._passwordEntry.end_busy();
         this._passwordEntry.set_text('');
         this._infoMessageLabel.set_text(text);
         this._infoMessageLabel.show();

js/ui/screensaver/unlockDialog.js

@@ -333,8 +333,10 @@ class UnlockDialog extends St.BoxLayout {
 
             this._passwordEntry.reactive = false;
             this._passwordEntry.hint_text = _("Checking...");
+            this._passwordEntry.start_busy();
         } else {
             this._passwordEntry.reactive = true;
+            this._passwordEntry.end_busy();
         }
     }