Spell checker problem

[RHJihan]

The bug Spell checker flags as incorrect when terminating a sentence with a sentence terminator other than a period. Such as flagging a correct word after inserting the Bengali period (U+0964) or U+0965. Android: 13

@BlackyHawky found (Android 10): All the numbers are underlined in red, as well as some capitalized words.

In English:

• 1 dollar --> "1" is underlined in red;
• A red car --> "A" is underlined in red but if you write "a red car" all is good;

In French:

• N'y vas pas (don't go in English) --> "N'y" is underlined in red but if you write "n'y vas pas" all is good;
• À demain (See you tomorrow in English) --> "À" is underlined in red but if you write "à demain" all is good

referral: https://github.com/Helium314/openboard/commit/a1cf043083159daafb0cc3b6157bfb90b6ce9ae5#commitcomment-123452992

[BlackyHawky]

I don't know if it's the same for you, but since this commit a1cf043, I often have emojis underlined in red too.

[Helium314]

I'll leave this to someone else, as I can't reproduce this on Android 9.

Possibly a first step would checking which words (TextInfos) are received in from system in AndroidSpellCheckerSession.onGetSuggestionsMultiple, AndroidSpellCheckerSession.onGetSentenceSuggestionsMultiple, or AndroidWordLevelSpellCheckerSession.onGetSuggestions.

Maybe also https://github.com/Helium314/openboard/commit/a1cf043083159daafb0cc3b6157bfb90b6ce9ae5 should be reverted depending on what the actual issue is.

[Helium314]

One thing I noticed that could be relevant here is that there is only one sentence separator (sentence_separator), while ? and ! are only in suggested_punctuations (does not contain .), symbols_word_separators and symbols_followed_by_space.