[NTG-context] Placement of floats with an "anchor"

[NTG-context] Placement of floats with an "anchor"

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Hi,

in my document, I recently left a TODO note that said:
"This floating graphic needs to be on the same page than this formula at the end."

My floating graphic currently uses:
\startplacefigure[title={bla}, location=top, reference=fig:bla]
	...
\stopplacefigure

The graphic should be at the top of the page where the formulas are typeset at the end.
Normally, I would do that manually, when all other text is finished.

Can I somehow automate this in ConTeXt? So defining a (non visible) "anchor" at a random place within the normal text and then tell ConTeXt to place the float at the same page (if possible)?

Here is a minimal example to play around (the float is placed on page 1, while the "anchor" is on page 2).

```
\starttext

\input{knuth}
\input{knuth}
\input{knuth}
% anchorto is made up to demonstrate the problem
\startplacefigure[title={A figure explaining the formula.}, location=top, reference=some, anchorto={eq:important}]
	\startalign[center]
		\style[sans]{This is a figure that explains the formula.}
	\stopalign
\stopplacefigure

It is explained with these equations (see also figure \in[some]):
\startformula[reference=eq:important]
	\startalign
		\NC a \NC = b \NR
		\NC a \NC = b \NR
		\NC a \NC = b \NR
		\NC a \NC = b \NR
		\NC a \NC = b \NR
		\NC a \NC = b \NR
		\NC a \NC = b \NR
		\NC a \NC = b \NR
		\NC a \NC = b \NR
	\stopalign
\stopformula
\input{knuth}
\input{knuth}
\input{ward}

\stoptext
```

Best
Gerion

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