Fixed searching for words containing a plus/minus sign

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

@@ -839,28 +839,17 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
             return false;
 
         text = Fts4DbHelper.breakText(text);
-        query = Fts4DbHelper.breakText(query);
 
-        boolean plus = false;
-        boolean minus = false;
         List<String> word = new ArrayList<>();
         for (String w : query.trim().split("\\s+"))
-            if ("+".equals(w))
+            if (w.length() > 1 && w.startsWith("+")) {
-                plus = true;
+                if (!text.contains(Fts4DbHelper.preprocessText(w.substring(1))))
-            else if ("-".equals(w))
-                minus = true;
-            else {
-                if (plus) {
-                    if (!text.contains(w))
                     return false;
-                } else if (minus) {
+            } else if (w.length() > 1 && w.startsWith("-")) {
-                    if (!html && text.contains(w))
+                if (!html && text.contains(Fts4DbHelper.preprocessText(w.substring(1))))
                     return false;
             } else
-                    word.add(w);
+                word.addAll(Arrays.asList(Fts4DbHelper.breakText(w).split("\\s+")));
-                plus = false;
-                minus = false;
-            }
 
         if (word.size() == 0)
             return true;

app/src/main/java/eu/faircode/email/Fts4DbHelper.java

@@ -134,7 +134,7 @@ public class Fts4DbHelper extends SQLiteOpenHelper {
         db.delete("message", "rowid = ?", new String[]{Long.toString(id)});
     }
 
-    private static String preprocessText(String text) {
+    static String preprocessText(String text) {
         return Normalizer.normalize(text.trim().toLowerCase(), Normalizer.Form.NFKD)
                 .replaceAll("[\\p{InCombiningDiacriticalMarks}]", "");
     }