Allow changing and removing of links

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

@@ -65,6 +65,7 @@ import android.text.style.ForegroundColorSpan;
 import android.text.style.ImageSpan;
 import android.text.style.QuoteSpan;
 import android.text.style.StyleSpan;
+import android.text.style.URLSpan;
 import android.util.TypedValue;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
@@ -1409,12 +1410,27 @@ public class FragmentCompose extends FragmentBase {
     private void onActionLink() {
         Uri uri = null;
 
-        ClipboardManager cbm = (ClipboardManager) getContext().getSystemService(Context.CLIPBOARD_SERVICE);
-        if (cbm != null && cbm.hasPrimaryClip()) {
-            String link = cbm.getPrimaryClip().getItemAt(0).coerceToText(getContext()).toString();
-            uri = Uri.parse(link);
-            if (uri.getScheme() == null)
-                uri = null;
+        if (etBody.hasSelection()) {
+            int start = etBody.getSelectionStart();
+            URLSpan[] spans = etBody.getText().getSpans(start, start, URLSpan.class);
+            if (spans.length > 0) {
+                String url = spans[0].getURL();
+                if (url != null) {
+                    uri = Uri.parse(url);
+                    if (uri.getScheme() == null)
+                        uri = null;
+                }
+            }
+        }
+
+        if (uri == null) {
+            ClipboardManager cbm = (ClipboardManager) getContext().getSystemService(Context.CLIPBOARD_SERVICE);
+            if (cbm != null && cbm.hasPrimaryClip()) {
+                String link = cbm.getPrimaryClip().getItemAt(0).coerceToText(getContext()).toString();
+                uri = Uri.parse(link);
+                if (uri.getScheme() == null)
+                    uri = null;
+            }
         }
 
         Bundle args = new Bundle();

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

@@ -87,6 +87,12 @@ public class FragmentDialogLink extends FragmentDialogBase {
                     }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
+                .setNeutralButton(R.string.title_reset, new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        sendResult(RESULT_OK);
+                    }
+                })
                 .create();
     }
 }

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

@@ -117,14 +117,17 @@ public class StyleHelper {
                         ss.removeSpan(span);
                     }
 
-                    if (start == end) {
-                        etBody.getText().insert(start, url);
-                        end += url.length();
-                        ss = new SpannableString(etBody.getText());
-                    }
+                    if (url != null) {
+                        if (start == end) {
+                            etBody.getText().insert(start, url);
+                            end += url.length();
+                            ss = new SpannableString(etBody.getText());
+                        }
 
-                    ss.setSpan(new URLSpan(url), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+                        ss.setSpan(new URLSpan(url), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+                    }
 
+                    // Restore other spans
                     for (Object span : spans)
                         ss.setSpan(span, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);