Redmine

I could not reproduce the problem. Could you describe the detailed steps to reproduce?

Here are the steps to reproduce this bug:

1 - Go to global /issues page¶

2 - Clear current query¶

3 - Export all columns to CSV file¶

4 - Click on Issues link in the menu (or go to /issues page without any parameter in the url)¶

All columns are now selected!

Here is my configuration:

Environment:
  Redmine version                3.4.2.stable
  Ruby version                   2.3.3-p222 (2016-11-21) [x86_64-darwin16]
  Rails version                  4.2.8
  Environment                    development
  Database adapter               PostgreSQL
SCM:
  Subversion                     1.9.4
  Git                            2.12.1
  Filesystem                     
Redmine plugins:
  no plugin installed

I have confirmed the problem in trunk and 3.4-stable.

You can fix this issue with the attached patch.

My customer experiences ActionDispatch::Cookies::CookieOverflow exception due to this defect. The Redmine has 200+ custom fields. A list of all custom fields is set to session[:issue_query][:column_names] after exporting all columns to CSV and the very long session value causes the exception.

The problem can be addressed by restoring the session value after sending CSV to the client.

Go MAEDA wrote:

The problem can be addressed by restoring the session value after sending CSV to the client.

The patch attached to #26785#note-5 worked fine for me, but I think it would be better to use the argument use_session of retrieve_query.

I attached a patch of proposed code and test code.

I cleaned up the code a little.

LGTM. Setting the target version to 3.4.7.

Committed the patch with a slight change in the test.
Thank you for reporting and fixing the issue.

Merged to 3.4-stable branch.