Github PR #2934 - Fixes #2764 - Removing last condition or action in Trigger/Automatization/Postmaster breaks dialogues.

app/assets/javascripts/app/controllers/_ui_element/postmaster_match.coffee

@@ -151,6 +151,7 @@ class App.UiElement.postmaster_match
 
     # remove filter
     item.find('.js-remove').bind('click', (e) =>
+      return if $(e.currentTarget).hasClass('is-disabled')
       $(e.target).closest('.js-filterElement').remove()
       @rebuildAttributeSelectors(item)
     )

app/assets/javascripts/app/controllers/_ui_element/ticket_perform_action.coffee

@@ -109,7 +109,7 @@ class App.UiElement.ticket_perform_action
         item.append(element)
         @rebuildAttributeSelectors(item, element, groupAndAttribute, elements, {}, attribute)
 
-      return item
+    else
 
       for groupAndAttribute, meta of params[attribute.name]
 
@@ -117,6 +117,8 @@ class App.UiElement.ticket_perform_action
         element = @placeholder(item, attribute, params, groups, elements)
         @rebuildAttributeSelectors(item, element, groupAndAttribute, elements, meta, attribute)
         item.append(element)
+    
+    @disableRemoveForOneAttribute(item)
     item
 
   @buildAttributeSelector: (elementFull, groups, elements) ->
@@ -145,6 +147,13 @@ class App.UiElement.ticket_perform_action
           optgroup.append("<option value=\"#{elementKey}\" #{selected}>#{displayName}</option>")
     selection
 
+  # disable - if we only have one attribute
+  @disableRemoveForOneAttribute: (elementFull) ->
+    if elementFull.find('.js-attributeSelector select').length > 1
+      elementFull.find('.js-remove').removeClass('is-disabled')
+    else
+      elementFull.find('.js-remove').addClass('is-disabled')
+
   @updateAttributeSelectors: (elementFull) ->
 
     # enable all
@@ -157,10 +166,7 @@ class App.UiElement.ticket_perform_action
     )
 
     # disable - if we only have one attribute
-    if elementFull.find('.js-attributeSelector select').length > 1
+    @disableRemoveForOneAttribute(elementFull)
-      elementFull.find('.js-remove').removeClass('is-disabled')
-    else
-      elementFull.find('.js-remove').addClass('is-disabled')
 
   @rebuildAttributeSelectors: (elementFull, elementRow, groupAndAttribute, elements, meta, attribute) ->
 

app/assets/javascripts/app/controllers/_ui_element/ticket_selector.coffee

@@ -200,6 +200,7 @@ class App.UiElement.ticket_selector
         triggerSearch()
       )
 
+    @disableRemoveForOneAttribute(item)
     item
 
   @preview: (item) ->
@@ -240,6 +241,13 @@ class App.UiElement.ticket_selector
             optgroup.append("<option value=\"#{elementKey}\">#{displayName}</option>")
     selection
 
+  # disable - if we only have one attribute
+  @disableRemoveForOneAttribute: (elementFull) ->
+    if elementFull.find('.js-attributeSelector select').length > 1
+      elementFull.find('.js-remove').removeClass('is-disabled')
+    else
+      elementFull.find('.js-remove').addClass('is-disabled')
+
   @updateAttributeSelectors: (elementFull) ->
 
     # enable all
@@ -252,10 +260,7 @@ class App.UiElement.ticket_selector
     )
 
     # disable - if we only have one attribute
-    if elementFull.find('.js-attributeSelector select').length > 1
+    @disableRemoveForOneAttribute(elementFull)
-      elementFull.find('.js-remove').removeClass('is-disabled')
-    else
-      elementFull.find('.js-remove').addClass('is-disabled')
 
 
   @rebuildAttributeSelectors: (elementFull, elementRow, groupAndAttribute, elements, meta, attribute) ->

public/assets/tests/form_ticket_perform_action.js

@@ -285,3 +285,81 @@ test( "ticket_perform_action backwards check after issue #2782", function() {
 
   deepEqual(params, test_params, 'form param check')
 });
+
+test( "ticket_perform_action rows manipulation", function() {
+  App.TicketPriority.refresh([
+    {
+      id:         2,
+      name:       '2 normal',
+      active:     false,
+    },
+    {
+      id:         1,
+      name:       '1 low',
+      active:     true,
+    },
+  ])
+
+  App.TicketState.refresh([
+    {
+      id:         1,
+      name:       'new',
+      active:     true,
+    },
+    {
+      id:         2,
+      name:       'open',
+      active:     true,
+    },
+    {
+      id:         3,
+      name:       'closed',
+      active:     false,
+    },
+  ])
+
+  $('#forms').append('<hr><h1>ticket_perform_action rows manipulation</h1><form id="form99"></form>')
+  var el = $('#form99')
+  var defaults = {
+    ticket_perform_action1: {
+      'ticket.state_id': {
+        value: '2'
+      }
+    }
+  }
+  new App.ControllerForm({
+    el:        el,
+    model:     {
+      configure_attributes: [
+        {
+          name:    'ticket_perform_action99',
+          display: 'TicketPerformAction99',
+          tag:     'ticket_perform_action',
+          null:    true,
+        },
+      ]
+    },
+    params: defaults,
+    autofocus: true
+  })
+
+  equal(true, true)
+
+  var selector = '[data-attribute-name="ticket_perform_action99"] '
+
+  $(selector + '.js-remove').click()
+
+  equal($(selector + '.js-filterElement').length, 1, 'prevents removing single initial row')
+
+  $(selector + '.js-add').click()
+
+  equal($(selector + '.js-filterElement').length, 2, 'adds 2nd row')
+
+  $(selector + ' .js-remove:last').click()
+
+  equal($(selector + '.js-filterElement').length, 1, 'removes 2nd row')
+
+  $(selector + '.js-remove:last').click()
+
+  equal($(selector + ' .js-filterElement').length, 1, 'prevents removing last row')
+});