Preview controls float above all canvas elements, obscuring other nodes

[coderabbitai]

Problem Description

Image preview controls (and potentially other preview controls) have a z-index that causes them to float above all other elements on the canvas. This makes it possible for entire nodes to be lost/hidden beneath the layers of a preview node, significantly impacting usability.

Visual Evidence

The issue is demonstrated in the screenshots below where nodes are completely obscured by preview layers:

Additional Context

• This issue was identified by @without-ordinary in prewiev image - multi images the number and close indicators hided behind the image #7667
• The issue persists even after PR Fix buttons displayed behind images in litegraph #7627 is applied (tested on commit 17be3b9)
• Screenshot after PR Fix buttons displayed behind images in litegraph #7627: https://github.com/user-attachments/assets/8ddbacba-3c17-4a60-a5a1-764000c8181a

References

• Original discussion: prewiev image - multi images the number and close indicators hided behind the image #7667
• Reported by: @without-ordinary
• Requested by: @christian-byrne

┆Issue is synchronized with this Notion page by Unito

[without-ordinary]

Coderabbit missed the 2nd image

Minimal repo for that: 7687.json

[without-ordinary]

Also multiline text fields.

[without-ordinary]

Preview and multiline string controls appear to float over its node when bypass (ie. they just dont change appearance when bypassed).