Save MR description when changing target branches in create mode

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Problem:

1. I create a branch B from branch A in the terminal
2. I push the branch and I get the MR link in the terminal
3. I click it and it opens the MR create page
4. I fill in the data (title and description, scroll down and then notice that the target branch is master, however I want to merge against A)
5. I click change target branches, go to that page and click Compare branches and continue
6. The description and title I filled in 4 are gone

Possible solution:

Use the autosave.js plugin we already use when accidentaly closing the tab while editing/creating an issue/mr/comment