Merge pull request #4 from kaleidot725/bugfix/fix_adding_new_line_bug

Fix new line bug

Author: kaleidot725

.idea/kotlinc.xml

@@ -1,7 +1,6 @@
 package jp.kaleidot725.texteditor.controller
 
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.Stable
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.text.TextRange
@@ -279,7 +278,19 @@ internal class EditorController(
     }
 
     private fun TextFieldValue.splitTextsByNL(): List<TextFieldValue> {
-        return this.text.split("\n").map { TextFieldValue(it, TextRange.Zero) }
+        var position = 0
+        val splitTexts = this.text.split("\n").map {
+            position += it.count()
+            it to position
+        }
+
+        return splitTexts.mapIndexed { index, pair ->
+            if (index == 0) {
+                TextFieldValue(pair.first, TextRange(pair.second))
+            } else {
+                TextFieldValue(pair.first, TextRange.Zero)
+            }
+        }
     }
 
     private enum class SelectionOption {

texteditor/src/main/java/jp/kaleidot725/texteditor/controller/EditorController.kt

@@ -175,7 +175,7 @@ class EditorControllerTest : StringSpec({
         controller.splitNewLine(targetIndex = 0, TextFieldValue(text = "aaa\n"))
 
         controller.fields.count() shouldBe 2
-        controller.fields[0].value shouldBe TextFieldValue(text = "aaa")
+        controller.fields[0].value shouldBe TextFieldValue(text = "aaa", selection = TextRange("aaa".count()))
         controller.fields[0].isSelected shouldBe false
         controller.fields[1].value shouldBe TextFieldValue(text = "")
         controller.fields[1].isSelected shouldBe true
@@ -185,7 +185,7 @@ class EditorControllerTest : StringSpec({
         controller.splitNewLine(targetIndex = 0, TextFieldValue(text = "aa\naa"))
 
         controller.fields.count() shouldBe 2
-        controller.fields[0].value shouldBe TextFieldValue(text = "aa")
+        controller.fields[0].value shouldBe TextFieldValue(text = "aa", selection = TextRange("aa".count()))
         controller.fields[0].isSelected shouldBe false
         controller.fields[1].value shouldBe TextFieldValue(text = "aa")
         controller.fields[1].isSelected shouldBe true
@@ -195,7 +195,7 @@ class EditorControllerTest : StringSpec({
         controller.splitNewLine(targetIndex = 0, TextFieldValue(text = "a\nb\nc\nd"))
 
         controller.fields.count() shouldBe 4
-        controller.fields[0].value shouldBe TextFieldValue(text = "a")
+        controller.fields[0].value shouldBe TextFieldValue(text = "a", selection = TextRange("a".count()))
         controller.fields[0].isSelected shouldBe false
         controller.fields[1].value shouldBe TextFieldValue(text = "b")
         controller.fields[1].isSelected shouldBe false