feat(study-screen): nosuggest:type field filter

[david-allison]

Note

Assisted-by: Claude Opus 4.7 - the code and a lot of bad research

Purpose / Description

This removes suggestions from the IME, so a language learner can learn an orthography without hints. It also removes the 'swipe' operation on the keyboard without showing the incognito icon.

This input mode will not be for all users: it makes Mandarin Chinese keyboards output in QWERTY only mode, and likely will disable voice input.

It is to be treated as an advanced feature, and is currently a hidden feature, planned to be exposed by the FieldFilter class.

nosuggest needs to come before type in the field filter list: type is processed by the backend, and AnkiDroid processes the remaining 'custom' filters

Usage: {{nosuggest:type:Field}}

Fixes

• Fixes Hide keyboard suggestions when typing answers #10352

Approach

• add a {{nosuggest:type:Field}} field filter
• Transformed to [[type:nosuggest:Field]] on the card
• TypeAnswer picks this up, and properties are used to impact an EditText
• Use InputType.TYPE_NULL to hude suggestions

How Has This Been Tested?

S21 5G: GBoard and Samsung Keyboard

Learning (optional, can help others)

The following were considered:

TYPE_TEXT_FLAG_AUTO_COMPLETE = false
TYPE_TEXT_FLAG_AUTO_CORRECT = false
TYPE_TEXT_FLAG_AUTO_CORRECT = false
TYPE_TEXT_VARIATION_FILTER = true
IME_FLAG_NO_PERSONALIZED_LEARNING = true

The above are not sufficient for GBoard - incognito shows, and the strip showing suggested words is still visible

TYPE_TEXT_VARIATION_VISIBLE_PASSWORD removed suggestions, but with an in-IME hint to open the password manager and a monospaced font on the field

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the [Google Accessibility Scanner](https://play.google.com/store/apps/details?id=com.google.android.apps.accessibility.auditor

[github-actions]

Snapshot diff report vs main. Open screenshot-diff for diffs.

• PreferencesScreenshotTest: 1 change

All 1 changed screenshots

PreferencesScreenshotTest

• ReviewerOptionsFragment_compare.png