Fix issue comment submit button disabled on GFM paste

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/40373 When copying some text from another note and paste, it goes through `copy_as_gfm` `paste` handler that calls `e.preventDefault()` which stops things. But then when inserting the text, we manually trigger an `input` event with jQuery which doesn't seem to be picked up by Vue `v-model`. Using copy/paste trick from https://stackoverflow.com/a/41046276/796832

Fix issue comment submit button disabled on GFM paste
078ba6a2 · Eric Eastwood · 52f5259a · 078ba6a2 · 078ba6a2
Commit 078ba6a2 authored Nov 21, 2017 by Eric Eastwood
Showing with 7 additions and 1 deletion

common_utils.js app/assets/javascripts/lib/utils/common_utils.js +1 -1

40373-fix-issue-note-submit-disabled-on-paste.yml ...eleased/40373-fix-issue-note-submit-disabled-on-paste.yml +6 -0

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--- a/app/assets/javascripts/lib/utils/common_utils.js
+++ b/app/assets/javascripts/lib/utils/common_utils.js
@@ -190,7 +190,7 @@ export const insertText = (target, text) => {
  target.selectionStart = target.selectionEnd = selectionStart + insertedText.length;

  // Trigger autosave
-  $(target).trigger('input');
+  target.dispatchEvent(new Event('input'));

  // Trigger autosize
  const event = document.createEvent('Event');

--- a/changelogs/unreleased/40373-fix-issue-note-submit-disabled-on-paste.yml
+++ b/changelogs/unreleased/40373-fix-issue-note-submit-disabled-on-paste.yml
+---
+title: Fix Issue comment submit button being disabled when pasting content from another
+  GFM note
+merge_request: 15530
+author:
+type: fixed