Fix toolbar get style

[Ge van Geldorp]

> From: Maxime Bellengé
> 
> When a toolbar receives a TB_GETSTYLE message with wParam=0, 
> the application expects to get the toolbar style and not the 
> first button style. This patch fixes eMule 0.42e, now the 
> toolbar is visible.
> 
> ChangeLog
>    * Fix TB_GETSTYLE to return the style of the toolbar when 
> wParam is 0

It seems there is another problem with the toolbar styles. When you CreateToolbarEx() with the WS_VISIBLE bit turned on, TOOLBAR_Create() will call GetWindowLongW() to get the window style and store that as the dwStyle member of TOOLBAR_INFO. Unfortunately, when the WM_CREATE message is sent the WS_VISIBLE bit of the window style retrieved with GetWindowLongW() is always turned off. It is turned on a little bit later, but no WS_STYLECHANGED is sent for this. So, the dwStyle member of TOOLBAR_INFO doesn't always mimick the "true" window style, it is possible that the WS_VISIBLE bit is off in TOOLBAR_INFO but on in the window style. If your app does something like:

SendMessage(hwndTB, TB_SETSTYLE, 0,
            SendMessage(hwndTB, TB_GETSTYLE, 0, 0) | TBSTYLE_FLAT );

this will make your toolbar invisible.

Gé van Geldorp.