-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi,
if you create a tab-panel with a callback, then on GNU/Linux the callback is called once by the system, but on Windows 7 it isn't. This can result in different initial tab visibility. For example: #lang racket/gui (define root (new frame% (width 300) (height 300) (label "Test tabs"))) (define (tab-callback tab-panel event) (send tab-panel change-children (lambda (children) (list (vector-ref tab-vector (send tab-panel get-selection)))))) (define tab-panel (new tab-panel% (parent root) (callback (lambda (tab-panel event) (displayln "called!") (tab-callback tab-panel event))) (choices '()))) (define tab1 (new panel% (parent tab-panel) (style '(deleted)))) ; <=== (define tab2 (new panel% (parent tab-panel) (style '(deleted)))) (define msg1 (new message% (parent tab1) (label "visible?"))) (define tabs `((,tab1 . "t1") (,tab2 . "t2"))) (define tab-names (map cdr tabs)) (define tab-vector (list->vector (map car tabs))) (send tab-panel set tab-names) (send root show #t) The difference in this example is caused by all tabs being initially deleted and the callback always enabling one tab. Arguably this is not a valid configuration (I don't know), but there are other ways to tickle this difference that don't rely on that: any effectful callback would exhibit the difference. Is it possible to remove this platform-dependent difference? Marijn -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk9U104ACgkQp/VmCx0OL2wNlgCeKYg8aGBi0182hcZI0415tqfT BHEAnR7h+hNlPBXpZYbaKjTuDgkgpu96 =7rnA -----END PGP SIGNATURE----- _________________________ Racket Developers list: http://lists.racket-lang.org/dev