diff --git a/include/eepp/core/string.hpp b/include/eepp/core/string.hpp
index 082edeb20..15e1675f7 100644
--- a/include/eepp/core/string.hpp
+++ b/include/eepp/core/string.hpp
@@ -307,6 +307,9 @@ class EE_API String {
 	**/
 	static String fromUtf8( const std::string& utf8String );
 
+	/** @return The number of codepoints of the utf8 string. */
+	static size_t utf8StringLength( const std::string& utf8String );
+
 	/** @brief Default constructor
 	** This constructor creates an empty string.
 	**/
diff --git a/src/eepp/core/string.cpp b/src/eepp/core/string.cpp
index 36fc8a2f5..2e3e71d0d 100644
--- a/src/eepp/core/string.cpp
+++ b/src/eepp/core/string.cpp
@@ -879,6 +879,25 @@ String String::fromUtf8( const std::string& utf8String ) {
 	return String( utf32 );
 }
 
+#define iscont( p ) ( ( *(p)&0xC0 ) == 0x80 )
+
+static inline const char* utf8_next( const char* s, const char* e ) {
+	while ( s < e && iscont( s + 1 ) )
+		++s;
+	return s < e ? s + 1 : e;
+}
+
+static inline size_t utf8_length( const char* s, const char* e ) {
+	size_t i = 0;
+	for ( i = 0; s < e; ++i )
+		s = utf8_next( s, e );
+	return i;
+}
+
+size_t String::utf8StringLength( const std::string& utf8String ) {
+	return utf8_length( utf8String.c_str(), utf8String.c_str() + utf8String.length() );
+}
+
 String::operator std::string() const {
 	return toUtf8();
 }
diff --git a/src/tools/ecode/plugins/linter/linterplugin.cpp b/src/tools/ecode/plugins/linter/linterplugin.cpp
index 59eb8ec06..aa1743d56 100644
--- a/src/tools/ecode/plugins/linter/linterplugin.cpp
+++ b/src/tools/ecode/plugins/linter/linterplugin.cpp
@@ -452,7 +452,7 @@ void LinterPlugin::drawAfterLineText( UICodeEditor* editor, const Int64& index,
 		String string( str );
 		line.setString( string );
 		Rectf box( pos - editor->getScreenPos(), { editor->getTextWidth( string ), lineHeight } );
-		match.box = box;
+		match.box[editor] = box;
 		line.draw( pos.x, pos.y + lineHeight * 0.5f );
 	}
 }
@@ -462,10 +462,10 @@ bool LinterPlugin::onMouseMove( UICodeEditor* editor, const Vector2i& pos, const
 	auto it = mMatches.find( editor->getDocumentRef().get() );
 	if ( it != mMatches.end() ) {
 		Vector2f localPos( editor->convertToNodeSpace( pos.asFloat() ) );
-		for ( const auto& matchIt : it->second ) {
+		for ( auto& matchIt : it->second ) {
 			auto& matches = matchIt.second;
-			for ( const auto& match : matches ) {
-				if ( match.box.contains( localPos ) ) {
+			for ( auto& match : matches ) {
+				if ( match.box[editor].contains( localPos ) ) {
 					editor->setTooltipText( match.text );
 					editor->getTooltip()->setDontAutoHideOnMouseMove( true );
 					editor->getTooltip()->setPixelsPosition( Vector2f( pos.x, pos.y ) );
diff --git a/src/tools/ecode/plugins/linter/linterplugin.hpp b/src/tools/ecode/plugins/linter/linterplugin.hpp
index 0c2fa1cf7..0a406e446 100644
--- a/src/tools/ecode/plugins/linter/linterplugin.hpp
+++ b/src/tools/ecode/plugins/linter/linterplugin.hpp
@@ -37,7 +37,7 @@ struct LinterMatch {
 	std::string text;
 	TextPosition pos;
 	String::HashType lineCache;
-	Rectf box;
+	std::map<UICodeEditor*, Rectf> box;
 	LinterType type{ LinterType::Error };
 };
 
diff --git a/src/tools/ecode/projectsearch.cpp b/src/tools/ecode/projectsearch.cpp
index ac095c3cc..baa7f31f8 100644
--- a/src/tools/ecode/projectsearch.cpp
+++ b/src/tools/ecode/projectsearch.cpp
@@ -35,7 +35,7 @@ static String textLine( const std::string& fileText, const size_t& fromPos, size
 	while ( ++ptr && *ptr != '\0' && *ptr != '\n' ) {
 	}
 	end = ptr - stringStartPtr;
-	relCol = String( fileText.substr( start, startPtr - nlStartPtr ) ).size();
+	relCol = String::utf8StringLength( fileText.substr( start, startPtr - nlStartPtr ) );
 	// if the line to substract is massive we only get the fist kilobyte of that line, since the
 	// line is only shared for visual aid.
 	return fileText.substr( start, end - start > EE_1KB ? EE_1KB : end - start );
@@ -69,11 +69,12 @@ searchInFileHorspool( const std::string& file, const std::string& text, const bo
 			totNl += countNewLines( fileText, lSearchRes, searchRes );
 			String str(
 				textLine( caseSensitive ? fileText : fileTextOriginal, searchRes, relCol ) );
-			res.push_back( { str,
-							 { { (Int64)totNl, (Int64)relCol },
-							   { (Int64)totNl, (Int64)( relCol + text.size() ) } },
-							 searchRes,
-							 static_cast<Int64>( searchRes + text.size() ) } );
+			res.push_back(
+				{ str,
+				  { { (Int64)totNl, (Int64)relCol },
+					{ (Int64)totNl, (Int64)( relCol + String::utf8StringLength( text ) ) } },
+				  searchRes,
+				  static_cast<Int64>( searchRes + text.size() ) } );
 			lSearchRes = searchRes;
 			searchRes += text.size();
 		}
@@ -188,4 +189,4 @@ void ProjectSearch::find( const std::vector<std::string> files, std::string stri
 	}
 }
 
-}
+} // namespace ecode
diff --git a/src/tools/ecode/uitreeviewglobalsearch.cpp b/src/tools/ecode/uitreeviewglobalsearch.cpp
index 39366e7ba..82739b2ab 100644
--- a/src/tools/ecode/uitreeviewglobalsearch.cpp
+++ b/src/tools/ecode/uitreeviewglobalsearch.cpp
@@ -11,10 +11,11 @@ namespace ecode {
 
 UITreeViewGlobalSearch::UITreeViewGlobalSearch( const SyntaxColorScheme& colorScheme,
 												bool searchReplace ) :
-	UITreeView(), mColorScheme( colorScheme ), mSearchReplace( searchReplace ) {
-	mLineNumColor = Color::fromString(
-		mUISceneNode->getRoot()->getUIStyle()->getVariable( "--font-hint" ).getValue() );
-}
+	UITreeView(),
+	mLineNumColor( Color::fromString(
+		mUISceneNode->getRoot()->getUIStyle()->getVariable( "--font-hint" ).getValue() ) ),
+	mColorScheme( colorScheme ),
+	mSearchReplace( searchReplace ) {}
 
 UIWidget* UITreeViewGlobalSearch::createCell( UIWidget* rowWidget, const ModelIndex& index ) {
 	UITableCell* widget = index.column() == (Int64)getModel()->treeColumn()