[Lazarus] Column ruler above a synedit

[Martin Frb]

On 10/02/2015 19:12, Mark Morgan Lloyd wrote:
> Is there a preferred way of putting a column ruler above the text in a 
> synedit, either (two lines) marking columns or (one line) marking tab 
> positions?
>
> I've previously done this for a file viewer oriented towards large 
> files with columnar text (e.g. database query output) by having two 
> synedits on the same form, but since the ruler doesn't really want 
> line numbers keeping the two lined up was not entirely reliable.
>

Look at  ide/SourceSynEditor.pp

constructor TIDESynEditor.Create(AOwner: TComponent);
....
   FPaintArea := TSourceLazSynSurfaceManager.Create(Self, FPaintArea);

It wraps the original paint area object, and reduces its size, then 
placing a new paintarea for its own purpose on top.

In this example the size is variable. For your case it would be fixed, 
so it should be easier.