Handle IME that puts the selection at the start of the composition
Handle IME that puts the selection at the start of the composition

FIX: Fix an issue where the editor needlessly interrupted composition with IME systems
that keep the cursor at the start of the composition, such as some Pinyin input methods.

See https://discuss.prosemirror.net/t/inputing-via-the-fcitx-input-methods-on-debian-the-first-character-in-a-new-paragraph-is-wrong/4475

ProseMirror/prosemirror-view