Generic toolbar button for skip, disable and error message

(transferred from ManageIQ/manageiq@5e9ecb1)

app/helpers/application_helper/button/generic_feature_button_with_disable.rb

@@ -0,0 +1,24 @@
+class ApplicationHelper::Button::GenericFeatureButtonWithDisable < ApplicationHelper::Button::GenericFeatureButton
+  needs_record
+
+  def calculate_properties
+    self[:enabled] = !(self[:title] = @error_message if disabled?)
+  end
+
+  def disabled?
+<<<<<<< HEAD
+    !!(@error_message = @record.is_available_now_error_message(@feature))
+=======
+    begin
+      begin
+        @error_message = @record.try(:unsupported_reason, @feature)
+      rescue NoMethodError
+        @error_message = @record.try(:is_available_now_error_message, @feature) if @error_message.nil?
+      end
+    rescue
+      @error_message = 'Feature is not supported.'
+      true
+    end
+>>>>>>> 407f786... fixup
+  end
+end

app/helpers/application_helper/toolbar/x_vm_center.rb

@@ -106,7 +106,7 @@ class ApplicationHelper::Toolbar::XVmCenter < ApplicationHelper::Toolbar::Basic
           'product product-clone fa-lg',
           t = N_('Clone this VM'),
           t,
-          :klass => ApplicationHelper::Button::GenericFeatureButton,
+          :klass   => ApplicationHelper::Button::GenericFeatureButton,
           :options => {:feature => :clone}),
         button(
           :vm_publish,
@@ -187,7 +187,8 @@ class ApplicationHelper::Toolbar::XVmCenter < ApplicationHelper::Toolbar::Basic
           N_('Power On'),
           :image   => "power_on",
           :confirm => N_("Power On this VM?"),
-          :klass   => ApplicationHelper::Button::VmStart),
+          :klass   => ApplicationHelper::Button::GenericFeatureButtonWithDisable,
+          :options => {:feature => :start}),
         button(
           :vm_stop,
           nil,