Add support for `CSI 16 t` - report character cell size in pixels

(cherry picked from commit 3a6a62ed)

src/Vt102Emulation.cpp

@@ -983,7 +983,8 @@ void Vt102Emulation::processToken(int token, int p, int q)
                                break;
 
     case token_csi_ps('t',   14) : reportPixelSize();          break;
-    case token_csi_ps('t',   18) : reportSize();          break;
+    case token_csi_ps('t',   16) : reportCellSize();           break;
+    case token_csi_ps('t',   18) : reportSize();               break;
     // change tab text color : \e[28;<color>t  color: 0-16,777,215
     case token_csi_ps('t',   28) : /* IGNORED: konsole-specific KDE3-era extension, not implemented */ break;
 
@@ -1562,6 +1563,17 @@ void Vt102Emulation::reportPixelSize()
     sendString(tmp);
 }
 
+void Vt102Emulation::reportCellSize()
+{
+    char tmp[30];
+    snprintf(tmp,
+             sizeof(tmp),
+             "\033[6;%d;%dt",
+             _currentScreen->currentTerminalDisplay()->terminalFont()->fontHeight(),
+             _currentScreen->currentTerminalDisplay()->terminalFont()->fontWidth());
+    sendString(tmp);
+}
+
 void Vt102Emulation::reportSize()
 {
     char tmp[30];

src/Vt102Emulation.h

@@ -161,6 +161,7 @@ private:
     void reportAnswerBack();
     void reportCursorPosition();
     void reportPixelSize();
+    void reportCellSize();
     void reportSize();
     void reportTerminalParms(int p);