Multiple modified spectra hotfix

Author: vikulin

app/build.gradle.kts

@@ -12,8 +12,8 @@ android {
         applicationId = "io.github.vikulin.opengammakit"
         minSdk = 24
         targetSdk = 35
-        versionCode = 18
-        versionName = "1.1.8"
+        versionCode = 19
+        versionName = "1.1.8.1"
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         setProperty("archivesBaseName", "ogk-inspector-$versionName")
     }

app/src/main/kotlin/io/github/vikulin/opengammakit/SpectrumFragment.kt

@@ -1514,10 +1514,16 @@ class SpectrumFragment : SerialConnectionFragment(),
             index in selectedIndexes
         }.toMutableList()
 
+        // Create a submap of derivedSpectra for selected indexes
+        val selectedDerivedSpectra = spectrumDataSet.derivedSpectra
+            .filterKeys { it in selectedIndexes }
+            .toMutableMap()
+
         // Create a new OpenGammaKitData with the same schema version and modified data
         val modifiedData = OpenGammaKitData(
             schemaVersion = spectrumDataSet.schemaVersion,
-            data = selectedEntries
+            data = selectedEntries,
+            derivedSpectra = selectedDerivedSpectra
         )
 
         // Call save method with the modified data