With Debian (or GTK…) windows have same name, class, ressources… so I 've to create a rule for each applications installed, and the new ones too… No way!!!
MinWinSize and MaxWinSize don’t work because of the modules…
So I finally tried with the 1. anhd create this function:
> DestroyModuleConfig FvwmEvent*
> *FvwmEvent: add_window SetGeometryForMyWindow
> DestroyFunc SetGeometryForMyWindow
> AddToFunc SetGeometryForMyWindow
> + I Focus
> + I Current (!FvwmButtons) Resize frame 50|da 50|da
50% area allow to place 4 differents windows on screen without resizing anything,
"frame option to calculate window size with border, not just the client area,
“da” option to keep Taskbar on sight,
Focus and Current make sure that the function targets new window,
!FvwmButtons to exclude Taskbar from resizing (curiously FvwmPager is excuded as soon as FvwmButton is!!!)
That’s what I wanted!!! (pfiew)
Thank you Thomas!