I made a patch to copy the tracker and attach it.
I confirmed that this patch works fine on latest trunk@20441.
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Thank you for posting the patch. I think the following change to the patch is necessary to fix an issue that the selection of "Copy workflow from" is cleared after validation error.

<pre><code class="diff">
diff --git a/app/views/trackers/_form.html.erb b/app/views/trackers/_form.html.erb
index b7c4b773f..2ccd225e6 100644
--- a/app/views/trackers/_form.html.erb
+++ b/app/views/trackers/_form.html.erb
@@ -39,7 +39,7 @@

<% if @tracker.new_record? && @trackers.any? %>
<p><label for="copy_workflow_from"><%= l(:label_copy_workflow_from) %></label>
-<%= select_tag(:copy_workflow_from, content_tag("option") + options_from_collection_for_select(@trackers, :id, :name, @copy_from.try(:id))) %></p>
+<%= select_tag(:copy_workflow_from, content_tag("option") + options_from_collection_for_select(@trackers, :id, :name, params[:copy_workflow_from] || @copy_from.try(:id))) %></p>
<% end %>
<!--[eoform:tracker]-->
</div>
</code></pre>
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Setting the target version to 4.2.0.
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Go MAEDA wrote:
> Thank you for posting the patch. I think the following change to the patch is necessary to fix an issue that the selection of "Copy workflow from" is cleared after validation error.
>
Thank you for pointing out.
I confirmed that the proposed code solves the problem in case of Validation error.

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Committed the patch. Thank you.
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The test randomly fails due to r20492.

<pre>
$ bin/rake db:reset RAILS_ENV=test
$ bin/rails test test/unit/tracker_test.rb:65
Run options: --seed 57984

# Running:

E

Error:
TrackerTest#test_copy_from_should_copy_custom_fields:
ActiveRecord::RecordNotFound: Couldn't find all IssueCustomFields with 'id': (1, 2, 6) [WHERE "custom_fields"."type" IN ('IssueCustomField')] (found 0 results, but was looking for 3). Couldn't find IssueCustomFields with ids 1, 2, 6.
test/object_helpers.rb:68:in `generate'
test/object_helpers.rb:76:in `generate!'
test/unit/tracker_test.rb:66:in `test_copy_from_should_copy_custom_fields'

bin/rails test test/unit/tracker_test.rb:65
</pre>

This can be fixed by adding a fixture.

<pre><code class="diff">
diff --git a/test/unit/tracker_test.rb b/test/unit/tracker_test.rb
index 1f3447da7..d4b383ea3 100644
--- a/test/unit/tracker_test.rb
+++ b/test/unit/tracker_test.rb
@@ -20,7 +20,7 @@
require File.expand_path('../../test_helper', __FILE__)

class TrackerTest < ActiveSupport::TestCase
- fixtures :trackers, :workflows, :issue_statuses, :roles, :issues, :projects, :projects_trackers, :enabled_modules
+ fixtures :trackers, :workflows, :issue_statuses, :roles, :issues, :custom_fields, :projects, :projects_trackers, :enabled_modules

def setup
User.current = nil
</code></pre>
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Thanks Go MAEDA.
I could also confirm that the test fails in the environment where the database was rebuilt.
As you pointed out, I missed the addition of fixture on my patch.
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Go MAEDA wrote:
> The test randomly fails due to r20492.

Committed the fix in r20534.

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