The kit-wide "these values disagree" sentinel. Used wherever a value is
aggregated across more than one source and the sources don't agree — e.g.
a UI panel aggregating a property across a multi-node selection, or text
styling aggregated across the runs in a character range. One symbol, one
isMixed check, regardless of what's being aggregated.
The kit-wide "these values disagree" sentinel. Used wherever a value is aggregated across more than one source and the sources don't agree — e.g. a UI panel aggregating a property across a multi-node selection, or text styling aggregated across the runs in a character range. One symbol, one
isMixedcheck, regardless of what's being aggregated.