Merge branch 'renable-import-button-when-namespace-already-been-taken' into 'master'

Renable import button when import process fail due to the namespace already been taken

Closes #19435

## Screenshots (if relevant)

Before:

![1](/uploads/e8de1b326e0751891f667630a7685f6a/1.png)<br/><br/>

After:

![2](/uploads/566f1fd5442c28232350689fce8eae76/2.png)

See merge request !5053
(cherry picked from commit d6efef0f)

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.9.5
+  - Re-enable import button when import process fails due to namespace already being taken. !5053
   - Fix snippets comments not displayed. !5045
   - Fix emoji paths in relative root configurations. !5027
   - Fix issues importing events in Import/Export. !4987

app/assets/javascripts/importer_status.js.coffee

@@ -7,13 +7,16 @@ class @ImporterStatus
     $('.js-add-to-import')
       .off 'click'
       .on 'click', (e) =>
-        new_namespace = null
         $btn = $(e.currentTarget)
         $tr = $btn.closest('tr')
+        $target_field = $tr.find('.import-target')
+        $namespace_input = $target_field.find('input')
         id = $tr.attr('id').replace('repo_', '')
-        if $tr.find('.import-target input').length > 0
-          new_namespace = $tr.find('.import-target input').prop('value')
-          $tr.find('.import-target').empty().append("#{new_namespace} / #{$tr.find('.import-target').data('project_name')}")
+        new_namespace = null
+
+        if $namespace_input.length > 0
+          new_namespace = $namespace_input.prop('value')
+          $target_field.empty().append("#{new_namespace}/#{$target_field.data('project_name')}")
 
         $btn
           .disable()

app/views/import/base/create.js.haml

 - if @already_been_taken
   :plain
-    target_field = $("tr#repo_#{@repo_id} .import-target")
+    tr = $("tr#repo_#{@repo_id}")
+    target_field = tr.find(".import-target")
+    import_button = tr.find(".btn-import")
     origin_target = target_field.text()
     project_name = "#{@project_name}"
     origin_namespace = "#{@target_namespace}"
@@ -10,6 +12,7 @@
     target_field.append("/" + project_name)
     target_field.data("project_name", project_name)
     target_field.find('input').prop("value", origin_namespace)
+    import_button.enable().removeClass('is-loading')
 - elsif @access_denied
   :plain
     job = $("tr#repo_#{@repo_id}")