https://bugzilla.wikimedia.org/show_bug.cgi?id=49233

       Web browser: ---
            Bug ID: 49233
           Summary: Visual Editor breaks with Unicode Combining diacritics
           Product: VisualEditor
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: General
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]
    Classification: Unclassified
   Mobile Platform: ---

Visual Editor doesn't behave correctly when editing and adding text with
combining diacritics.

For example insert the text "ɛ́" (ɛ is character U+025B, combining acute is
U+0301).
When the cursor is behind "ɛ́":
- pushing the left arrow doesn't move the cursor
- adding text like "ɛ́abcdef" is fine but:
  - pushing backspace gives "ɛ́abcda" instead of expected "ɛ́abcde"
  - pushing return ives "ɛ́abcde\na"

Some languages require combining diacritics, many keyboard layouts allow their
input or user can insert them by copying and pasting from somewhere else.

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