Add Autocomplete to Multi-Select Metadata Fields

📋 Summary

Add autocomplete support when typing into multi-select metadata fields such as Genre, Series, and supported custom fields.

❗ Problem

Some metadata fields can contain long lists of existing values. When editing game metadata, users may need to scroll or type exact values manually, which can slow down bulk editing and increase the chance of inconsistent entries.

For example, typing rac should quickly suggest or jump to Racing instead of requiring the user to find it manually.

💡 Proposal

Improve multi-select metadata fields so typing filters and suggests matching existing values.

This could include:

• Showing matching values as the user types

• Highlighting the best match

• Allowing Enter or Tab to accept the suggestion

• Supporting partial matches, such as rac for Racing

• Applying the same behavior to Genre, Series, and similar multi-select/custom fields

🧩 Use Cases

• Quickly add Racing to several games

• Select a Series without scrolling through a long list

• Reuse existing custom field values consistently

• Speed up metadata cleanup for large libraries

📦 Benefits

• Faster metadata editing

• Less scrolling through long value lists

• Reduces duplicate or inconsistent values

• Improves usability for large libraries

⚠️ Considerations

Autocomplete should clearly distinguish between selecting an existing value and creating a new one where custom values are allowed.