fix: properly highlight search results with accents and diacritics (#435)

Refs: https://github.com/FossifyOrg/Contacts/issues/12

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Fixed
 - Fixed invisible navigation bars in contact viewer ([#415])
+- Fixed search highlighting for characters with accents and diacritics ([#12])
 
 ## [1.4.0] - 2025-10-29
 ### Changed
@@ -98,6 +99,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Initial release
 
+[#12]: https://github.com/FossifyOrg/Contacts/issues/12
 [#30]: https://github.com/FossifyOrg/Contacts/issues/30
 [#78]: https://github.com/FossifyOrg/Contacts/issues/78
 [#201]: https://github.com/FossifyOrg/Contacts/issues/201

app/src/main/kotlin/org/fossify/contacts/adapters/ContactsAdapter.kt

@@ -391,7 +391,9 @@ class ContactsAdapter(
             findViewById<ConstraintLayout>(org.fossify.commons.R.id.item_contact_frame)?.isSelected = selectedKeys.contains(contact.id)
             val fullName = contact.getNameToDisplay()
             findViewById<TextView>(org.fossify.commons.R.id.item_contact_name).text = if (textToHighlight.isEmpty()) fullName else {
-                if (fullName.contains(textToHighlight, true)) {
+                val normalizedFullName = fullName.normalizeString()
+                val normalizedSearchText = textToHighlight.normalizeString()
+                if (normalizedFullName.contains(normalizedSearchText, true)) {
                     fullName.highlightTextPart(textToHighlight, properPrimaryColor)
                 } else {
                     fullName.highlightTextFromNumbers(textToHighlight, properPrimaryColor)