problems with NSMatrix insertColumn and GS vs Mac difference

[Riccardo Mottola]

Hi,

I want to display a sort of "list" using a single-row NSMatrix. I add 
all cells at once.

On Mac, I have the following code, each time I update the list:


  [legendMatrix removeColumn:0];
<...>
  [legendMatrix renewRows:[legendCellArray count] columns:1]; /* This 
is needed on Mac to resize the matrix before inserting the new column 
*/
  [legendMatrix insertColumn:0 withCells:legendCellArray];
  [legendMatrix sizeToCells];

"renewRows" is absolutely needed, or insertColumn will crash. Do you 
think this code is correct? It appears to work fine

On GNUstep, this gives me second, empty column at the right of the 
column with the legendCellArray items.
On gnustep I can remove renewRows and everything works fine.

Before saying this is a bug, I ask if the code looks sound to you.

"insertColumn" always confuses me. The Doc says:
f column is greater than the number of columns in the receiver, enough 
columns are created to expand the receiver to be column columns wide. 
newCells should either be empty or contain a sufficient number of 
cells to fill each new column. If newCells is nil or an array with no 
elements, the call is equivalent to calling insertColumn:. Extra cells 
are ignored, unless the matrix is empty. In that case, a matrix is 
created with one column and enough rows for all the elements of 
newCells.

If I have none, I'd expect it to insert one (like GNUstep) and not to 
crash, perhaps 0 is a special case?


Thank you - Riccardo