Add MR link to the "This MR already exists" error (#19752) · Issues · GitLab.org / GitLab · GitLab

Add MR link to the "This MR already exists" error

It would be handy if we add MR link to the error view below. ![Screen_Shot_2017-10-05_at_03.10.34](/uploads/d66c6bcafb733dc3075b0d1f2eeae2db/Screen_Shot_2017-10-05_at_03.10.34.png)

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