bug#38497: 27.0.50; Frame is not rendered when frame-resize-pixelwise it 't

[martin rudalics]

> The default emacs frame is just around a quarter of screen size (as it
> appears in floating window layout) and I can sometimes see it appearing
> for a split second in a tile layout before being resized.

Having a tiled layout, do you need to set 'frame-resize-pixelwise' to
t at all?  I thought a tiling WM would ignore size hints anyway.

> Also, as I showed in emacs -Q recipe, failure to redraw the frame
> can also be triggered in a maximised or a full screen emacs frame. The
> frame is also being resized there, though it is much less noticeable
> (just closing small gap below the maximised frame).

This seems typical of applying a frame character size based
maximization first and a pixelwise maximization afterwards.  Does it
fully maximize immediately when you build Emacs with the default
configuration or do you see such an intermediate frame size too?

martin