Improve suggestion handling for chinese input

[mehul-m-prajapati]

fixes #1283

/claim #1283

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[ClytzeL]

I would like the suggestion menu to always open whenever the user is typing between the compositionStart and compositionEnd events.But here colsed the menu.Maybe like the code follows?

...
let _isComposing = false; 
export class SuggestionMenuProseMirrorPlugin<
...
apply(transaction, prev, _oldState, newState): SuggestionPluginState {
          if (_isComposing) {
            return prev;
          }
...
props: {
        handleDOMEvents:{
          compositionstart:(view)=>{
            console.log('run compositionstart');
            _isComposing = true;
            view.dispatch(view.state.tr.setMeta("isComposing", true));
            return false;
          },
          compositionend:(view)=>{
            console.log('run compositionend');
            _isComposing = false;
            view.dispatch(view.state.tr.setMeta("isComposing", false));
            return false;
          }
        },
        handleTextInput(view, _from, _to, text) {
...

[mehul-m-prajapati]

@ClytzeL : I have updated the code. Can you please test again ?