Disabling suggestions on Android if readonly mode is set.

[Aarontheissueguy]

Set "TYPE_TEXT_FLAG_NO_SUGGESTIONS" as "InputType" if "readonly" is True and testing it in the backend probe

This ensures that no spelling suggestions are made if a text is set to readonly.

Fixes #2136

[freakboy3742]

Looks good, and works well in my testing.

There's a couple of things standing in the way of me merging this:

1. When you submit a PR that closes a ticket, you need to include the text Fixes #xxx in the PR description; this is the trigger to Github to close the issue when the PR is merged. I've made this modification on your behalf.
2. Toga's CI requires that every PR include a changenote - this is why CI is currently failing. In this case, we need a file named changes/2136.bugfix.rst , with a single line of content that reads something like "Multiline text inputs no longer show spelling suggestions when in readonly mode."
3. When you submit a PR, it's really helpful if you submit the PR from a branch of your fork, rather than the main branch. The missing changenote is a fairly minor thing, so ordinarily I would add it myself as part of the review process - but because you've submitted from your main branch, I can't do that: maintainers can edit PRs submitted from a branch, but not PRs submitted from your main. Submitting from a branch also makes your life easier in the long run, because it allows you to have multiple PRs in flight at the same time (after all, you can only have 1 main) - but once your PR is merged, it also means the reconciliation process is easier, because your fork's mainline can stay a "clean" copy of the upstream repository, rather than something you need to merge or rebase.

There's no need to re-work this PR to be from a different branch; if you add the changenote, I'll be happy to merge it. But it's worth keeping in mind for next time.

[Aarontheissueguy]

Thanks for the tips, I will keep them in mind the next time I contribute. I added the changenote as requested.

[freakboy3742]

Getting closer - now the PR is hitting a pre-commit issue. We apply black formatting to format our code, and we check that every commit has had black applied. If you follow the contributors guide you can install pre-commit locally, and have these fixes applied automatically when you commit code. In this case, you'll need to run pre-commit run --all over your code to apply the fixes to previous commits.

[freakboy3742]

Ok - now we're at a "real" problem, not just a cosmetic one: The test you've added is failing in CI.

[Aarontheissueguy]

hmm... Il look into it. Not entirely sure what causes this though.

[Aarontheissueguy]

Thats weird, we didn't tamper with anything iOS related, did we?

[freakboy3742]

The good news (for you) is that the iOS failure has nothing to do with you. I landed an unrelated change to Briefcase this morning, and that is causing problems with Toga's CI.

[freakboy3742]

The CI problem has now been fixed - so this is good to land!

Thanks for contribution!