BUGS
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- dmalloc shows duplicate deletion after merging two lines and
  deleting the second half

- word wrap for objects with lots of non-space needs to search in positive
  direction if begin of first object is reached

  - delete in empty line doesn't always work
  - fix initial scrollbar sizes
  - fix horiz scrollbar size


TODO
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Formatting of first text in message in M is broken.

Selections:
  - moving in negative direction doesn't work
  - selection state not properly reset, only works once
  - selecting non-text objects is strange

wxllist::GetSize() requires extra Layout() call, which should not be
necessary. Find out why this is so.
YES, it is necessary, because the normal drawing only happens within
the visible window.
I must find a way to re-Layout() objects. This is only required after
their sizes change:
- Just mark them as dirty:
    - mark current line as dirty when editing it (so width gets recalculated)
    - mark all following lines as dirty when changing font settings
    - Let Layout() work only on the dirty lines.
  !!! GOOD: this can also be used to recalculate the wxLayoutObjectCmds'
            fonts! :-)

- searching for text
- moving cursor in non-edit mode
- cursor screen positioning ignores font sizes once again :-(
   --> UpdateCursorScreenPos() cannot work as it ignores previous font formatting commands.
       Either draw cursor when drawing text, or wait for new wxLayoutObjectCmd to be fully
       implemented.

RECENTLY FIXED (?)
  - fix(simplify) cursor size calculation
  - delete in empty line doesn't work
  - fix horiz scrollbar size OK here, a Mahogany problem?
  - with a large number of lines, wraps to top of scrolled window
    --> check where the problem lies, add a debug function showing all coordinates
  
- update rectangle (needs support in wxllist and wxWindows)
  --> needs a bit of fixing still
      some code bits are commented out in wxlwindow.cpp
      offset handling seems a bit dodgy, white shadow to top/left of cursor


  - replacement of llist in window
  - undo
  - font optimisations(!)
  - occasionally wraps lines wongly (twice) ??
  - UNDO
  later:
    - DragNDrop ... broken in wxGTK at present
    - cut&paste ... broken in wxGTK at present, Paste already implemented
    - Selections

- More optimisations:
  - let each line have a pointer to the last layoutcommand and let that
    one only store the settings that changed, then we no longer need to
    recalculate all the lines