Message draft discarded when switching to different chat quickly

[WofWca]

• Operating System (Linux/Mac/Windows/iOS/Android):

• Delta Chat Version: c878fc7

• Expected behavior: Draft message saved

• Actual behavior: Draft message remains unchanged

• Steps to reproduce the problem:

  1. Open a chat
  2. Write something without pausing for more than a second
  3. Switch to a different chat within a second after making the last change to the draft.

• Screenshots:
  

• Logs:

Example use case: paste something in the message composer and then immediately switch to a different chat.

This has to do with this debounce

deltachat-desktop/src/renderer/components/composer/ComposerMessageInput.tsx

Lines 49 to 52 in 584b59c

	this.saveDraft = debounce(() => {
	const { text, chatId } = this.state
	this.props.updateDraftText(text.trim() === '' ? '' : text, chatId)
	}, 1000)

when the chat is switched, the state of the component changes and its text gets assigned the value of the other chat's text, so the draft of the previous chat is lost.
I have attemted to updateDraftText() with prevState.text, but it refuses to save the draft here

deltachat-desktop/src/renderer/components/composer/Composer.tsx

Lines 539 to 541 in 584b59c

	if (chatId !== InputChatId) {
	log.warn("chat Id and InputChatId don't match, do nothing")
	} else {

Then I thought I'd call BackendRemote.rpc.miscSetDraft() anyway, but it looks like it depends on a ton of other state, so we need prevState there as well I guess.

deltachat-desktop/src/renderer/components/composer/Composer.tsx

Lines 503 to 510 in 584b59c

	await BackendRemote.rpc.miscSetDraft(
	accountId,
	chatId,
	draft.text,
	draft.file !== '' ? draft.file : null,
	draft.quote?.kind === 'WithMessage' ? draft.quote.messageId : null,
	draft.viewType
	)