Fix another possible index-out-of-bounds when inserting characters. Fix terminal display image buffer overflow when rendering double-height lines.

svn path=/trunk/KDE/kdebase/apps/konsole/; revision=709594

src/Screen.cpp

@@ -307,6 +307,9 @@ void Screen::insertChars(int n)
 {
   if (n == 0) n = 1; // Default
 
+  if ( screenLines[cuY].size() < cuX )
+    screenLines[cuY].resize(cuX);
+
   screenLines[cuY].insert(cuX,n,' ');
 
   if ( screenLines[cuY].count() > columns )