Add refresh button for debug log

src/mainwindow.cpp

@@ -1986,10 +1986,7 @@ void MainWindow::setupMiningTab() {
     }
 }
 
-void MainWindow::setupDebugLogTab() {
-    ui->debugLog->setReadOnly(true);
-    ui->debugLog->setPlainText("Some debug stuff");
-
+QString MainWindow::readDebugLines() {
 #ifdef Q_OS_LINUX
     QFile file(QDir::homePath() + "/.hush/HUSH3/debug.log");
 #elif defined(Q_OS_DARWIN)
@@ -2004,7 +2001,7 @@ void MainWindow::setupDebugLogTab() {
         DEBUG(": Found debug.log at " << file);
     } else {
         DEBUG("No debug.log found!");
-        return;
+        return "";
     }
 
     if(file.open(QIODevice::ReadOnly))
@@ -2023,9 +2020,23 @@ void MainWindow::setupDebugLogTab() {
         }
         file.seek(file.pos()+2);
         QString debugText = file.readAll();
-        ui->debugLog->setPlainText( debugText );
+        DEBUG("got " << debugText.size() << " bytes of debugText");
+        file.close();
+        return debugText;
     }
+    return "";
+}
+
+void MainWindow::setupDebugLogTab() {
+    ui->debugLog->setReadOnly(true);
+    ui->debugLog->setPlainText("Loading debug log...");
+
+    QObject::connect(ui->refreshDebugButton, &QPushButton::clicked, [=] () {
+        DEBUG("refresh debug log clicked");
+        ui->debugLog->setPlainText( readDebugLines() );
+    });
 
+    ui->debugLog->setPlainText( readDebugLines() );
 }
 
 void MainWindow::setupPeersTab() {

src/mainwindow.h

@@ -85,6 +85,7 @@ private:
     void closeEvent(QCloseEvent* event);
 
 
+    QString readDebugLines();
     void setupSendTab();
     void setupPeersTab();
     void setupTransactionsTab();

src/mainwindow.ui

@@ -1137,7 +1137,34 @@
        </attribute>
 
       <layout class="QGridLayout" name="gridLayout">
-       <item row="0" column="0" colspan="3">
+
+       <item row="0" column="0">
+                     <widget class="QPushButton" name="refreshDebugButton">
+                      <property name="enabled">
+                       <bool>true</bool>
+                      </property>
+                      <property name="sizePolicy">
+                       <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+                        <horstretch>0</horstretch>
+                        <verstretch>0</verstretch>
+                       </sizepolicy>
+                      </property>
+                      <property name="minimumSize">
+                       <size>
+                        <width>0</width>
+                        <height>0</height>
+                       </size>
+                      </property>
+                      <property name="toolTip">
+                        Click to see the latest debug log data
+                       <string/>
+                      </property>
+                      <property name="text">
+                       <string>Refresh</string>
+                      </property>
+                     </widget>
+       </item>
+       <item row="1" column="0" colspan="3">
         <widget class="QPlainTextEdit" name="debugLog">
          <property name="plainText">
           <string/>