comment draft lags when defocusing tab

- open a comment
- type some stuff into it
- click the gitcasso popup
- BUG: the draft is not there
- close the popup and open it again
- now the draft is there.

The sequence of events is:

- open popup
- popup sends `GET_OPEN_SPOTS` to background
- background replies with `GetTableRowsResponse`
- because popup has focus, the tab lost focus
- tab notices and sends `LOST_FOCUS` event with updated draft
- but the rows were already sent

Workaround: if you defocus the text area manually by clicking somewhere else in the tab, and then click the popup, then the popup is up-to-date right away.

Reproduce the popup sequence described in the issue, then trace the popup/background exchange for GET_OPEN_SPOTS and the tab's LOST_FOCUS event carrying the updated draft. Check the handling of GetTableRowsResponse and focus changes; done means reopening or opening the popup immediately shows the latest comment draft.

由索引模型根据 Issue 内容生成。