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Issues and Merge Request filters does not work in IE11

Summary

IE11 is throwing 400 Bad Request error when you try to filter issues or merge requests with any criteria.

Steps to reproduce

  • Open GitLab IE11
  • Go to any project /issues or /merge_requests page.
  • Try to filter using any criteria
  • Hit enter to perform search

What is the current bug behavior?

Browser throws 400 Bad Request error.

What is the expected correct behavior?

Browser should be able to search based on filter provided.

Screenshot (GIF)

IE11_Broken_Filter

Output of checks

This bug happens on GitLab.com

Possible Fix

filtered_search_manager.js#L387 has statement;

const parameterizedUrl = `?scope=all&utf8=✓&${paths.join('&')}`;

where utf8=✓ is causing this bug, and ✓ symbol requires to be encoded (using encodeURIComponent) to work properly with IE, also behavior with other browsers will remain unaffected after this change.