[geary/wip/714104-refine-account-dialog] Implement basic support for disabling accounts

[Michael Gratton <mjog src gnome org>]

commit 48559f28fe590eab4aeeb036a7d04ac9ac38e927
Author: Michael Gratton <mike vee net>
Date:   Sun Dec 9 19:26:58 2018 +1100

    Implement basic support for disabling accounts

 src/client/accounts/accounts-editor-list-pane.vala | 27 ++++++++++++++++++----
 src/client/accounts/accounts-manager.vala          |  7 ++++++
 2 files changed, 29 insertions(+), 5 deletions(-)
---
diff --git a/src/client/accounts/accounts-editor-list-pane.vala 
b/src/client/accounts/accounts-editor-list-pane.vala
index 131610e5..95b764fd 100644
--- a/src/client/accounts/accounts-editor-list-pane.vala
+++ b/src/client/accounts/accounts-editor-list-pane.vala
@@ -372,17 +372,34 @@ private class Accounts.AccountListRow : AccountRow<EditorListPane,Gtk.Grid> {
     }
 
     public void update_status(Manager.Status status) {
-        if (status != Manager.Status.UNAVAILABLE) {
-            this.unavailable_icon.hide();
+        bool enabled = false;
+        switch (status) {
+        case ENABLED:
+            enabled = true;
             this.set_tooltip_text("");
-        } else {
-            this.unavailable_icon.show();
+            break;
+
+        case DISABLED:
             this.set_tooltip_text(
+                // Translators: Tooltip for accounts that have been
+                // loaded by disabled by the user.
+                _("This account has been disabled")
+            );
+            break;
+
+        case UNAVAILABLE:
+            this.set_tooltip_text(
+                // Translators: Tooltip for accounts that have been
+                // loaded but because of some error are not able to be
+                // used.
                 _("This account has encountered a problem and is unavailable")
             );
+            break;
         }
 
-        if (status == Manager.Status.ENABLED) {
+        this.unavailable_icon.set_visible(!enabled);
+
+        if (enabled) {
             this.label.get_style_context().remove_class(
                 Gtk.STYLE_CLASS_DIM_LABEL
             );
diff --git a/src/client/accounts/accounts-manager.vala b/src/client/accounts/accounts-manager.vala
index be2db840..e3c20ac6 100644
--- a/src/client/accounts/accounts-manager.vala
+++ b/src/client/accounts/accounts-manager.vala
@@ -656,6 +656,13 @@ public class Accounts.Manager : GLib.Object {
             }
         }
 
+        // If the account has been marked as disabled, mark it as such
+        // and bail out.
+        if (status == Status.DISABLED) {
+            set_enabled(account, false);
+            throw new ConfigError.UNAVAILABLE("Account disabled");
+        }
+
         return account;
     }