fix: allow ':keyword' make mistakes

[asjqkkkk]

When inserting an emoji by using “:”, allow the continuation of input with a string of up to 5 characters even if no results are found

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Improve emoji search input handling by allowing users to continue typing and exploring emoji suggestions even when initial results are empty

Bug Fixes:

• Prevent premature dismissal of emoji picker when no initial results are found

Enhancements:

• Extend emoji search input tolerance to allow continued typing up to 5 additional characters
• Add a 'no results' message when no emojis match the current search query

[sourcery-ai]

Reviewer's Guide

This pull request enhances the emoji search by allowing continued input (up to 5 characters) even when no results are found. This is implemented by tracking the last fruitless search query with a new state variable, lastSearchedQuery, in _EmojiHandlerState. The emoji picker only dismisses if the user types 5 more characters without finding a match. The UI now displays a localized 'No results' message in this scenario. A scroll operation safety check was also added.

File-Level Changes

Change	Details	Files
Modified emoji search to tolerate typos by delaying dismissal.	Introduced lastSearchedQuery state variable to track the search query when no results are found. Updated _searchEmoji to dismiss the picker only if the current query is 5+ characters longer than lastSearchedQuery. Reset lastSearchedQuery when search results are found again.	frontend/appflowy_flutter/lib/plugins/emoji/emoji_handler.dart
Updated UI to display a localized 'No results' message.	Added a 'No results' message display within buildEmojis when the search yields no emojis. Integrated easy_localization for the message text and imported necessary libraries. Adjusted container padding and child rendering logic in build to correctly display the 'No results' message instead of a loading indicator.	frontend/appflowy_flutter/lib/plugins/emoji/emoji_handler.dart
Added safety check for scroll operations.	Guarded scrolling operations in _scrollToItem by checking scrollController.hasClients.	frontend/appflowy_flutter/lib/plugins/emoji/emoji_handler.dart

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[sourcery-ai]

Hey @asjqkkkk - I've reviewed your changes - here's some feedback:

• The 5-character limit for allowing continued input on empty emoji search results is hardcoded; consider defining this as a named constant for improved readability and easier modification.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[richardshiue]

The change is good, but it seems like it's become too lenient now:

Screen.Recording.2025-05-12.at.2.01.33.PM.mov

[asjqkkkk]

The change is good, but it seems like it's become too lenient now:

Screen.Recording.2025-05-12.at.2.01.33.PM.mov

This issue has existed since the previous version, and I haven't found a good solution to address it yet