Make sure the imageSizeChanged signal is emitted at least once.

Without this patch, the shell or other app might have a wrong idea as to the
size of the terminal, because the size has never explicitely been set.

This patch uses a boolean flag, to make sure the signal gets emitted at
least once.  An alternative would be to change the default screen sizes. 
One could either choose 24x80 as the default screen size, as this is what
most apps expect, or 1x1, as this is almost certainly different from any
screen size actually used.  The first approach relies on defaults which need
not be fixed, and should therefore be avoided.  Both approaches force a
resize of the screens created in the constructor, which is some overhead I'd
like to avoid.  Neither one bool of data nor the added control structures
seems expensive enough to discourage this approach.

https://bugs.kde.org/show_bug.cgi?id=176902
https://bugs.gentoo.org/show_bug.cgi?id=357945
https://bugzilla.redhat.com/show_bug.cgi?id=477359

2011-04-06 Patch by Martin von Gagern
based on ideas from Kurt V. Hindenburg and Jonathan Wakely

Index: konsole-4.6.1/konsole/src/Emulation.cpp
===================================================================
--- konsole-4.6.1.orig/konsole/src/Emulation.cpp
+++ konsole-4.6.1/konsole/src/Emulation.cpp
@@ -55,7 +55,8 @@ Emulation::Emulation() :
   _codec(0),
   _decoder(0),
   _keyTranslator(0),
-  _usesMouse(false)
+  _usesMouse(false),
+  _imageSizeSet(false)
 {
   // create screens with a default size
   _screen[0] = new Screen(40,80);
@@ -344,12 +345,20 @@ void Emulation::setImageSize(int lines,
   QSize newSize(columns,lines);
 
   if (newSize == screenSize[0] && newSize == screenSize[1])
-    return;    
+  {
+    if (!_imageSizeSet)
+    {
+      emit imageSizeChanged(lines,columns);
+      _imageSizeSet = true;
+    }
+    return;
+  }
 
   _screen[0]->resizeImage(lines,columns);
   _screen[1]->resizeImage(lines,columns);
 
   emit imageSizeChanged(lines,columns);
+  _imageSizeSet = true;
 
   bufferedUpdate();
 }
Index: konsole-4.6.1/konsole/src/Emulation.h
===================================================================
--- konsole-4.6.1.orig/konsole/src/Emulation.h
+++ konsole-4.6.1/konsole/src/Emulation.h
@@ -462,6 +462,7 @@ private:
   bool _usesMouse;
   QTimer _bulkTimer1;
   QTimer _bulkTimer2;
+  bool _imageSizeSet;
   
 };