2032068 - Don't show empty variables as unset in the @container tooltip

Status: RESOLVED INVALID

(DevTools :: Inspector: Rules, defect)

Description

[Nicolas Chevobbe [:nchevobbe]]

After Bug 2030239, the @container tooltip will be able to display custom properties values
But since we're using the computed style CSSStyleProperties#getPropertyValue to get the value, we are getting an empty value when the variable isn't set, but also when the variable is an empty string (which is valid).
It would be nice to properly handle this to avoid any confusion, but that requires a bit of work in platform (see Bug 2032064)

Comment 1

[Nicolas Chevobbe [:nchevobbe]]

Attachment: Bug 2032068 - [devtools] Use hasLonghandProperty to detect set but empty CSS variables in StyleRuleActor##getFeaturesForContainerQueryConditions. r=#devtools.

Comment 2

[Nicolas Chevobbe [:nchevobbe]]

I was able to work on Bug 2032064, so the changes for this were directly done in Bug 2030239