Improved search highlight

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

@@ -881,7 +881,7 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
         if (TextUtils.isEmpty(text))
             return false;
 
-        text = Fts4DbHelper.breakText(text);
+        text = Fts4DbHelper.processBreakText(text);
 
         List<String> word = new ArrayList<>();
         for (String w : query.trim().split("\\s+"))
@@ -892,7 +892,7 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
                 if (!html && text.contains(Fts4DbHelper.preprocessText(w.substring(1))))
                     return false;
             } else
-                word.addAll(Arrays.asList(Fts4DbHelper.breakText(w).split("\\s+")));
+                word.addAll(Arrays.asList(Fts4DbHelper.processBreakText(w).split("\\s+")));
 
         if (word.size() == 0)
             return true;

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

@@ -118,10 +118,10 @@ public class Fts4DbHelper extends SQLiteOpenHelper {
         cv.put("folder", message.folder);
         cv.put("time", message.received);
         cv.put("address", MessageHelper.formatAddresses(address.toArray(new Address[0]), true, false));
-        cv.put("subject", breakText(message.subject));
+        cv.put("subject", processBreakText(message.subject));
         cv.put("keyword", TextUtils.join(" ", message.keywords));
-        cv.put("text", breakText(text));
+        cv.put("text", processBreakText(text));
-        cv.put("notes", breakText(message.notes));
+        cv.put("notes", processBreakText(message.notes));
         db.insertWithOnConflict("message", null, cv, SQLiteDatabase.CONFLICT_FAIL);
     }
 
@@ -138,12 +138,14 @@ public class Fts4DbHelper extends SQLiteOpenHelper {
                 .replaceAll("[\\p{InCombiningDiacriticalMarks}]", "");
     }
 
-    static String breakText(String text) {
+    static String processBreakText(String text) {
         if (TextUtils.isEmpty(text))
             return "";
 
-        text = preprocessText(text);
+        return breakText(preprocessText(text));
+    }
 
+    static String breakText(String text) {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N)
             return text;
 
@@ -187,7 +189,7 @@ public class Fts4DbHelper extends SQLiteOpenHelper {
             SQLiteDatabase db,
             Long account, Long folder, long[] exclude,
             BoundaryCallbackMessages.SearchCriteria criteria, String query) {
-        String search = escape(breakText(query));
+        String search = escape(processBreakText(query));
 
         String select = "";
         if (account != null)

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

@@ -3009,7 +3009,8 @@ public class HtmlHelper {
             sb.insert(0, ".*?\\b(");
             sb.append(")\\b.*?");
 
-            Pattern p = Pattern.compile(sb.toString(), Pattern.DOTALL);
+            // TODO: match für for fur
+            Pattern p = Pattern.compile(sb.toString(), Pattern.DOTALL | Pattern.CASE_INSENSITIVE);
 
             NodeTraversor.traverse(new NodeVisitor() {
                 @Override
@@ -3017,9 +3018,7 @@ public class HtmlHelper {
                     if (node instanceof TextNode)
                         try {
                             TextNode tnode = (TextNode) node;
-                            String whole = tnode.getWholeText();
+                            String text = tnode.getWholeText();
-                            String text = Fts4DbHelper.preprocessText(whole);
-                            String ref = (whole.length() == text.length() ? whole : text);
 
                             Matcher result = p.matcher(text);
 
@@ -3029,7 +3028,7 @@ public class HtmlHelper {
                                 int start = result.start(1);
                                 int end = result.end(1);
 
-                                holder.appendText(ref.substring(prev, start));
+                                holder.appendText(text.substring(prev, start));
 
                                 Element span = document.createElement("span");
                                 span.attr("style", mergeStyles(
@@ -3037,7 +3036,7 @@ public class HtmlHelper {
                                         "font-size:larger !important;" +
                                                 "font-weight:bold !important;" +
                                                 "background-color:" + encodeWebColor(color) + " !important"));
-                                span.text(ref.substring(start, end));
+                                span.text(text.substring(start, end));
                                 holder.appendChild(span);
 
                                 prev = end;
@@ -3047,7 +3046,7 @@ public class HtmlHelper {
                                 return;
 
                             if (prev < text.length())
-                                holder.appendText(ref.substring(prev));
+                                holder.appendText(text.substring(prev));
 
                             tnode.before(holder);
                             tnode.text("");