Experiment: delete translated text

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -591,6 +591,7 @@ public class FragmentCompose extends FragmentBase {
         etBody.addTextChangedListener(new TextWatcher() {
             private Integer added = null;
             private Integer removed = null;
+            private Integer replaced = null;
 
             @Override
             public void beforeTextChanged(CharSequence text, int start, int count, int after) {
@@ -598,6 +599,10 @@ public class FragmentCompose extends FragmentBase {
                     Log.i("Removed=" + start);
                     removed = start;
                 }
+                if (BuildConfig.DEBUG && count - after == 1) {
+                    replaced = start + after;
+                    Log.i("Replaced=" + replaced);
+                }
             }
 
             @Override
@@ -736,6 +741,22 @@ public class FragmentCompose extends FragmentBase {
                     removed = null;
                 }
 
+                if (replaced != null && replaced > 0) {
+                    StyleHelper.TranslatedSpan[] nc =
+                            text.getSpans(replaced - 1, replaced, StyleHelper.TranslatedSpan.class);
+                    if (nc != null)
+                        for (StyleHelper.TranslatedSpan p : nc) {
+                            int start = text.getSpanStart(p);
+                            int end = text.getSpanEnd(p);
+                            if (end == replaced) {
+                                text.delete(start, end);
+                                text.removeSpan(p);
+                            }
+                        }
+
+                    replaced = null;
+                }
+
                 if (lp != null)
                     TextUtils.dumpSpans(text, lp, "---after>");
             }
@@ -2154,6 +2175,8 @@ public class FragmentCompose extends FragmentBase {
                          */
                         int len = 2 + translation.translated_text.length();
                         edit.insert(paragraph.second, "\n\n" + translation.translated_text);
+                        StyleHelper.markAsTranslated(edit, paragraph.second, paragraph.second + len);
+
                         etBody.setSelection(paragraph.second + len);
 
                         boolean small = prefs.getBoolean("deepl_small", false);

app/src/main/java/eu/faircode/email/StyleHelper.java

@@ -27,6 +27,8 @@ import android.graphics.Typeface;
 import android.os.Build;
 import android.text.Editable;
 import android.text.Layout;
+import android.text.NoCopySpan;
+import android.text.Spannable;
 import android.text.SpannableStringBuilder;
 import android.text.Spanned;
 import android.text.TextUtils;
@@ -79,7 +81,8 @@ public class StyleHelper {
             QuoteSpan.class, IndentSpan.class,
             StrikethroughSpan.class,
             URLSpan.class,
-            TypefaceSpan.class, CustomTypefaceSpan.class
+            TypefaceSpan.class, CustomTypefaceSpan.class,
+            TranslatedSpan.class
     ));
 
     static boolean apply(int action, LifecycleOwner owner, View anchor, EditText etBody, Object... args) {
@@ -925,6 +928,15 @@ public class StyleHelper {
         }
     }
 
+    static void markAsTranslated(Editable text, int start, int end) {
+        for (TranslatedSpan span : text.getSpans(0, text.length(), TranslatedSpan.class))
+            text.removeSpan(span);
+        text.setSpan(new TranslatedSpan(), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+    }
+
+    static class TranslatedSpan implements NoCopySpan {
+    }
+
     static String getFamily(String family) {
         // https://web.mit.edu/jmorzins/www/fonts.html
         // https://en.wikipedia.org/wiki/Croscore_fonts