Does anyone use math inset locking?

[Scott Kostyshak]

I came across what I thought was a bug. In the attached, if I put the
cursor just inside the note and press ctrl + i for inset-toggle, I
expected the note to close.

I looked around in the code, and I found an interesting chunk in InsetMathNest.cpp:

	// 'Locks' the math inset. A 'locked' math inset behaves as a unit
	// that is traversed by a single <CursorLeft>/<CursorRight>.
	case LFUN_INSET_TOGGLE:
		cur.recordUndo();
		lock(!lock());
		cur.popForward();
		break;

I don't know if that is actually related to the issue I was looking at,
but I had never heard of this feature. Does anyone use it? Can someone
give me an example of a case where it is used? Is it indeed saved in the
file format? I think I might find this feature useful.

It is fun to discover new features no matter how long I've been around LyX.

Scott
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