On Wed, Apr 27, 2022 at 12:19 AM Marcel Taeumel <marcel.taeumel at hpi.de>
wrote:

>
> Hi Eliot --
>
> No, this cannot be preserved on the VM side without again introducing that
> major performance regression that has been there for several years now on
> the macOS platform. I strongly argue that we keep the VM platform code this
> way.
>

You *cannot* just break older images.  This constitutes a fork in the VM.

>
> However, it can *very easily* be fixed in most (if not all) older images.
> Just disable deferred (display) updates as it was not supported on macOS
> for a very (!) long time:
>
>    PasteUpMorph disableDeferredUpdates: true.
>    Project allMorphicProjects do: [:ea | ea world canvas: nil].
>

If it can be fixed easily at the image level then it can be fixed at the VM
level, for example, by adding a status bit to new images which invokes the
new behaviour in the VM.  Haivng to modify old images is ass backwards.;

> > To reproduce take e.g. Squeak 6.0 alpha [...]
>
> No, Squeak6.0alpha (Trunk) does not show this issue unless it is not an
> updated image. Still, this update has been part of the update stream for
> several weeks now.
>
> > [...] or the ;ast of the 5.x line [...]
>
> The above snippet accounts for this *very easily*. It even works in Squeak
> 4.x. This is an image-side thing. It always has been. Since 1999. This is
> not a VM issue.
>
> Best,
> Marcel
>
> P.S.: Keep in mind that ST80-style "Fast dragging" is always an
> alternative in older images:
>    Preferences enable: #fastDragWindowForMorphic.
>
> Am 27.04.2022 03:29:31 schrieb Eliot Miranda <eliot.miranda at gmail.com>:
> Hi Marcel,
>
> the issue of windows being invisible when dragged in the new VM is a
> major bug. The VM needs to be backwards compatible. It souldn't break old
> images. So we need to find a way of restoring the default behaviour in
> images that don't set the relevant preference.
>
> To reproduce take e.g. Squeak 6.0 alpha or the ;ast of the 5.x line and
> simply try and move a window about As soon as the window starts to move it
> disappears and then reappears when the mouse button is released. This must
> be fixed.
> _,,,^..^,,,_
> best, Eliot
> Hi Marcel,
>
>     the issue of windows being invisible when dragged in the new VM is a
> major bug.  The VM needs to be backwards compatible.  It souldn't break old
> images.  So we need to find a way of restoring the default behaviour in
> images that don't set the relevant preference.
>
> To reproduce take e.g. Squeak 6.0 alpha or the ;ast of the 5.x line and
> simply try and move a window about  As soon as the window starts to move it
> disappears and then reappears when the mouse button is released.  This must
> be fixed.
> _,,,^..^,,,_
> best, Eliot
>
>

-- 
_,,,^..^,,,_
best, Eliot
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