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

[martin rudalics]

>> ... If not, can you tell me the four values here
>> when it fails to redraw - that of FRAME_PIXEL_WIDTH (f), pixel_width,
>> FRAME_PIXEL_HEIGHT (f) and pixel_height.
>
> Not sure how to get those.

By running Emacs under the debugger and putting a breakpoint at that
position.  But let's put that aside for the moment since, as you say,
this part is not the real cause of the problem anyway.

> Actually, this piece of code seems to be a more specific reason
> triggering the bug (see the relevant patch attached - that patch makes
> the bug disappear).

Unfortunately, that patch breaks pixelwise resizing.  The frame could
then be resized only in character size increments, defeating the entire
original purpose of 'frame-resize-pixelwise'.

> I tried your suggestion (no idea how it is different from original code
> though). It makes no difference.

I would have been surprised if it did.

> A possible hint to why this code fails to resize the frame is that my
> WM resizes the frame as soon as it is created. It is not a gradual
> resizing with mouse, but rather instant resize to pre-calculated size
> (according to layout). I can sometimes even see the frame being created
> with much smaller size for a split second followed by resizing it to
> target size.

How do you create such a frame in the first place?

martin