reading text from the keyboard input panel will return the string in Unicode NFC

.idea/libraries/ibm_icu_icu4j.xml

@@ -0,0 +1,14 @@
+<component name="libraryTable">
+  <library name="ibm.icu.icu4j" type="repository">
+    <properties maven-id="com.ibm.icu:icu4j:70.1" />
+    <CLASSES>
+      <root url="jar://$PROJECT_DIR$/lib/icu4j-70.1.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$PROJECT_DIR$/lib/icu4j-70.1-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$PROJECT_DIR$/lib/icu4j-70.1-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

src/net/torvald/terrarum/ui/UIItemTextLineInput.kt

@@ -7,6 +7,7 @@ import com.badlogic.gdx.graphics.OrthographicCamera
 import com.badlogic.gdx.graphics.Pixmap
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import com.badlogic.gdx.graphics.glutils.FrameBuffer
+import com.ibm.icu.text.Normalizer2
 import com.jme3.math.FastMath
 import net.torvald.terrarum.*
 import net.torvald.terrarum.gamecontroller.*
@@ -433,9 +434,11 @@ class UIItemTextLineInput(
     }
 
     private fun textbufToString(): String {
-        return textbuf.toJavaString()
+        return textbuf.toJavaString().toUnicodeNFC()
     }
 
+    private fun String.toUnicodeNFC() = Normalizer2.getNFCInstance().normalize(this)
+
     private fun moveCursorToEnd(stride: Int) {
         try {
             cursorX += stride

terrarum.terrarum.iml

@@ -23,5 +23,6 @@
     <orderEntry type="library" name="gdx-platform-1.10.0-natives-desktop" level="project" />
     <orderEntry type="library" name="graalvm-js-21.1.0 and graalvm-js-scriptengine-21.1.0" level="project" />
     <orderEntry type="library" name="jetbrains.kotlinx.coroutines.core" level="project" />
+    <orderEntry type="library" name="ibm.icu.icu4j" level="project" />
   </component>
 </module>