TW #2020: reserved.lines is not affecting the burndown height

- Thanks to ad₋si.

AUTHORS

@@ -328,3 +328,4 @@ suggestions:
   php-coder
   Martin F. Krafft
   tom-doerr
+  ad-si

ChangeLog

@@ -95,6 +95,8 @@
            Thanks to Kirill Bobyrev
 - TW #1922 Can't find export scripts
            Thanks to tom-doerr
+- TW #2020 reserved.lines is not affecting the burndown height
+           Thanks to ad₋si
 - Added 'juhannus' as a synonym for 'midsommarafton'
           Thanks to Lynoure Braakman
 - Deprecated the 'DUETODAY' virtual tag, which is a synonym for the 'TODAY'

src/commands/CmdBurndown.cpp

@@ -171,7 +171,9 @@ Chart::Chart (char type)
   // How much space is there to render in?  This chart will occupy the
   // maximum space, and the width drives various other parameters.
   _width = Context::getContext ().getWidth ();
-  _height = Context::getContext ().getHeight () - 1;  // Allow for new line with prompt.
+  _height = Context::getContext ().getHeight ()
+          - Context::getContext ().config.getInteger ("reserved.lines")
+          - 1;  // Allow for new line with prompt.
   _graph_height = _height - 7;
   _graph_width = _width - _max_label - 14;