Emit signal on receiving escape sequence for changing terminal size

This is just one needed prerequisite for supporting the resizing
escape sequence. I still have no clear clue of adding the support
correctly

src/Emulation.h

@@ -375,6 +375,12 @@ signals:
      */
     void imageSizeInitialized();
 
+    /**
+     * Emitted after receiving the escape sequence which asks to change
+     * the terminal emulator's size
+     */
+    void imageResizeRequest(const QSize& sizz);
+
     /**
      * Emitted when the terminal program requests to change various properties
      * of the terminal display.

src/Session.cpp

@@ -141,6 +141,8 @@ Session::Session(QObject* parent) :
             SLOT(onPrimaryScreenInUse(bool)));
     connect(_emulation, SIGNAL(selectedText(QString)), this,
             SLOT(onSelectedText(QString)));
+    connect( _emulation, SIGNAL(imageResizeRequest(QSize)) , this,
+             SIGNAL(resizeRequest(QSize)) );
 
     //create new teletype for I/O with shell process
     openTeletype(-1);

src/Vt102Emulation.cpp

@@ -544,7 +544,9 @@ void Vt102Emulation::processToken(int token, int p, int q)
     case TY_ESC_DE('8'      ) : _currentScreen->helpAlign            (          ); break;
 
 // resize = \e[8;<row>;<col>t
-    case TY_CSI_PS('t',   8) : setImageSize( p /*lines */, q /* columns */ );    break;
+    case TY_CSI_PS('t',   8) : setImageSize( p /*lines */, q /* columns */ );
+                               emit imageResizeRequest(QSize(q, p));
+                               break;
 
 // change tab text color : \e[28;<color>t  color: 0-16,777,215
     case TY_CSI_PS('t',   28) : emit changeTabTextColorRequest      ( p        );          break;