Improve handling of country/prefix information appended to decoded CQ messages

The  use  of  QTextEdit::toPlainText() converts  non-break  spaces  to
normal spaces so  was breaking the use of that  character to delineate
appended info. Since using  QTextEdit::toPlainText() is an unnecessary
operation as  the decoded text  can be more amenably  accessed through
the QDocument  and QTextBlock interface without  any translation, this
is an improvement which should  have some performance impact when many
decodes are stored in the decodes windows.

decodedtext.cpp

@@ -20,6 +20,7 @@ DecodedText::DecodedText (QString const& the_string)
   , message_ {string_.mid (column_qsoText + padding_).trimmed ()}
   , is_standard_ {false}
 {
+  qDebug () << "DecodedText: the_string:" << the_string << "Nbsp pos:" << the_string.indexOf (QChar::Nbsp);
   if (message_.length() >= 1)
     {
        message0_ = message_.left(36);

displaytext.cpp

@@ -76,6 +76,7 @@ void DisplayText::insertLineSpacer(QString const& line)
 void DisplayText::appendText(QString const& text, QColor bg,
                              QString const& call1, QString const& call2)
 {
+  qDebug () << "DisplayText::appendText: text:" << text << "Nbsp pos:" << text.indexOf (QChar::Nbsp);
   auto cursor = textCursor ();
   cursor.movePosition (QTextCursor::End);
   auto block_format = cursor.blockFormat ();

mainwindow.cpp

@@ -6903,27 +6903,28 @@ void MainWindow::replyToCQ (QTime time, qint32 snr, float delta_time, quint32 de
 
   QString format_string {"%1 %2 %3 %4 %5 %6"};
   auto const& time_string = time.toString ("~" == mode || "&" == mode ? "hhmmss" : "hhmm");
-  auto cqtext = format_string
+  auto message_line = format_string
     .arg (time_string)
     .arg (snr, 3)
     .arg (delta_time, 4, 'f', 1)
     .arg (delta_frequency, 4)
     .arg (mode, -2)
     .arg (message_text);
-  auto messages = ui->decodedTextBrowser->toPlainText ();
+  QTextCursor start {ui->decodedTextBrowser->document ()};
-  auto position = messages.lastIndexOf (cqtext);
+  start.movePosition (QTextCursor::End);
-  if (position < 0)
+  auto cursor = ui->decodedTextBrowser->document ()->find (message_line, start, QTextDocument::FindBackward);
+  if (cursor.isNull ())
     {
       // try again with with -0.0 delta time
-      position = messages.lastIndexOf (format_string
+      cursor = ui->decodedTextBrowser->document ()->find (format_string
                                                           .arg (time_string)
                                                           .arg (snr, 3)
                                                           .arg ('-' + QString::number (delta_time, 'f', 1), 4)
                                                           .arg (delta_frequency, 4)
                                                           .arg (mode, -2)
-                                       .arg (message_text));
+                                                          .arg (message_text), start, QTextDocument::FindBackward);
     }
-  if (position >= 0)
+  if (!cursor.isNull ())
     {
       if (m_config.udpWindowToFront ())
         {
@@ -6936,14 +6937,11 @@ void MainWindow::replyToCQ (QTime time, qint32 snr, float delta_time, quint32 de
           showNormal ();
           raise ();
         }
-      // find the linefeed at the end of the line
-      position = ui->decodedTextBrowser->toPlainText().indexOf(QChar::LineFeed,position);
       if (message_text.contains (QRegularExpression {R"(^(CQ |CQDX |QRZ ))"})) {
         // a message we are willing to accept and auto reply to
         m_bDoubleClicked = true;
       }
-      auto start = messages.left (position).lastIndexOf (QChar::LineFeed) + 1;
+      DecodedText message {message_line};
-      DecodedText message {messages.mid (start, position - start)};
       Qt::KeyboardModifiers kbmod {modifiers << 24};
       processMessage (message, kbmod);
       tx_watchdog (false);
@@ -6951,7 +6949,7 @@ void MainWindow::replyToCQ (QTime time, qint32 snr, float delta_time, quint32 de
     }
   else
     {
-      qDebug () << "process reply message ignored, decode not found:" << cqtext;
+      qDebug () << "process reply message ignored, decode not found:" << message_line;
     }
 }
 
@@ -6988,10 +6986,12 @@ void MainWindow::replayDecodes ()
   // is not checked
 
   // attempt to parse the decoded text
-  Q_FOREACH (auto const& message
+  for (QTextBlock block = ui->decodedTextBrowser->document ()->firstBlock (); block.isValid (); block = block.next ())
-             , ui->decodedTextBrowser->toPlainText ().split (QChar::LineFeed,
-                                                             QString::SkipEmptyParts))
     {
+      auto message = block.text ();
+      message = message.left (message.indexOf (QChar::Nbsp)); // discard
+                                                              // any
+                                                              // appended info
       if (message.size() >= 4 && message.left (4) != "----")
         {
           auto const& parts = message.split (' ', QString::SkipEmptyParts);
@@ -7001,14 +7001,8 @@ void MainWindow::replayDecodes ()
             }
           else
             {
-              auto eom_pos = message.indexOf (' ', 35);
-              // we always want at least the characters to position 35
-              if (eom_pos < 35)
-                {
-                  eom_pos = message.size () - 1;
-                }
               // TODO - how to skip ISCAT decodes
-              postDecode (false, message.left (eom_pos + 1));
+              postDecode (false, message);
             }
         }
     }