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Fix IDE commit to use start_ref

See merge request gitlab-org/gitlab-ce!30079

**Why?**
The branch HEAD could be changed since the
IDE was opened. This leads to user's unintentionally
creating commits that overwrite other changes.

https://gitlab.com/gitlab-org/gitlab-ce/issues/59023

Fix gl_dropdown scrolling to top on assignee click

See merge request gitlab-org/gitlab-ce!29500

(cherry picked from commit 2a29f910)

3130572f Fix gl_dropdown scrolling to top on assignee click