Fixed broken DBC string signal code, make signal size automatically update in signal editor

dbc/dbc_classes.cpp

@@ -45,7 +45,7 @@ bool DBC_SIGNAL::processAsText(const CANFrame &frame, QString &outString)
     if (valType == STRING)
     {
         QString buildString;
-        int startByte = signalSize / 8;
+        int startByte = startBit / 8;
         int bytes = signalSize / 8;
         for (int x = 0; x < bytes; x++) buildString.append(frame.data[startByte + x]);
         outString = buildString;

dbc/dbcsignaleditor.cpp

@@ -139,7 +139,7 @@ DBCSignalEditor::DBCSignalEditor(DBCHandler *handler, QWidget *parent) :
                 if (currentSignal == NULL) return;
                 currentSignal->unitName = ui->txtUnitName->text().simplified().replace(' ', '_');
             });
-    connect(ui->txtBitLength, &QLineEdit::editingFinished,
+    connect(ui->txtBitLength, &QLineEdit::textChanged,
             [=]()
             {
                 if (currentSignal == NULL) return;