Visualizations aren't shown (immediately) when computed!

[JaroslavTulach]

Context

There are various inquiries related to visualizations (like #10525). Users often complain:

• "we don't get widgets"
• "we don't get arguments"
• "we don't get visualizations"
• "we don't get component colors"

Until everything is computed!

It is Broken!

As a sample demonstration of one kind of such problem let's use following simple project:

from Standard.Base import all
import Standard.Visualization

main =
    v = 6 * 7
    v2 = Runtime.sleep 3000 v
    v3 = Runtime.sleep 7000 v2
    v4 = Runtime.sleep 10000 v3
    v4

Here is a video of that project opening in 2025.3.1-rc1 version of Enso:

SlowVisualizations.webm

As can be seen, the visualizations for variable v, v2, v3 aren't shown until computation of the last variable v4 is finished!

Goal

• There are many different inquiries related to visualizations
• the focus of this issue is as narrow as possible
• show visualizations of v, v2 and v3 variables as soon as they are computed when opening the project
• don't wait until v4 is computed

[JaroslavTulach]

It Does Work (in some situations)!

• the problem only occurs when opening the project
• when the value of variable v is modified
• the visualization are updated immediately as following video shows

FastVisualizations.webm

• the problem is thus only occurring when new visualization are being attached
• all that's needed is to attach visualizations even when computation is already running

[JaroslavTulach]

Proof of Concept

• RuntimeCache.onModification to notify when a value is updated #14741 PR shows the RuntimeCache.onModification concept that seems to work
• as explained by this comment RuntimeCache.onModification to notify when a value is updated #14741 (comment)

OnModificationVisualizations.webm