add copy image

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -377,7 +377,7 @@ class ReaderActivity : EhActivity() {
 
     }
 
-    private fun copyImage(page: Int) {
+    fun copyImage(page: Int) {
         if (null == mGalleryProvider) {
             return
         }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPageSheet.kt

@@ -20,6 +20,7 @@ class ReaderPageSheet(
         binding = ReaderPageSheetBinding.inflate(activity.layoutInflater, null, false)
 
         binding.share.setOnClickListener { share() }
+        binding.copy.setOnClickListener { copy() }
         binding.save.setOnClickListener { save() }
         binding.saveTo.setOnClickListener { saveTo() }
 
@@ -34,6 +35,14 @@ class ReaderPageSheet(
         dismiss()
     }
 
+    /**
+     * Copy the image of this page with external apps.
+     */
+    private fun copy() {
+        activity.copyImage(page.index)
+        dismiss()
+    }
+
     /**
      * Saves the image of this page on external storage.
      */