[Vm-dev] [squeak-dev] new VM breaks window dragging in old images. that's not backwards compatibility in my book.

[Marcel Taeumel]

Hi Eliot --

You are just talking about a feature specific to Morphic. Let's not forget about that. ;-)

Best,
Marcel
Am 27.04.2022 19:58:24 schrieb Eliot Miranda <eliot.miranda at gmail.com>:


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