Block quote white space improvement

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

@@ -907,34 +907,45 @@ public class MessageHelper {
                 int level = 0;
                 String[] lines = result.split("\\r?\\n");
                 for (String line : lines) {
+                    // Opening quotes
                     int tlevel = 0;
-                    while (line.trim().startsWith(">")) {
+                    while (line.startsWith(">")) {
                         tlevel++;
                         if (tlevel > level)
                             sb.append("<blockquote>");
-                        while (line.startsWith(" "))
-                            line = line.substring(1);
+
+                        line = line.substring(1); // >
+
+                        if (line.startsWith(" "))
                             line = line.substring(1);
                     }
+
+                    // Closing quotes
                     for (int i = 0; i < level - tlevel; i++)
                         sb.append("</blockquote>");
                     level = tlevel;
 
+                    // Show as-is
                     line = Html.escapeHtml(line);
 
+                    // Non breaking spaces
+                    boolean start = true;
                     int len = line.length();
                     for (int j = 0; j < len; j++) {
                         char kar = line.charAt(j);
                         if (kar == ' ' &&
-                                j + 1 < len && line.charAt(j + 1) == ' ')
+                                (start || j + 1 < len && line.charAt(j + 1) == ' '))
                             sb.append("&nbsp;");
-                        else
+                        else {
+                            start = false;
                             sb.append(kar);
                         }
+                    }
 
                     sb.append("<br>");
                 }
 
+                // Closing quotes
                 for (int i = 0; i < level; i++)
                     sb.append("</blockquote>");