Tree Panel markup other than visible

Hello,

I'm using Tree Panel component and I'm doing a filtration using my customize filterFn function.

However, I've didn't found any method, which allows me to count tree leaves after tree filtration.

Since a filtered node is marked with positive "visible" attribute, but is really visible when tree is shown (expanded), it`s attribute is visible most of time,

How can I run a function, which count all filtered (for both shown and not-shown) nodes?

I'm attaching 2 codes block here:

1. Count all leaves (ignores filtration)

var filtered_leaves = 0;

store.getRootNode().cascadeBy(function(node) {

if (node.isLeaf()) {

filtered_leaves++;

}

});

2. Count all leaves (count only leaves when those are visible and shown on screen. (expanded and filtered)

var filtered_leaves = 0;

store.getRootNode().cascadeBy(function(node) {

if (node.isLeaf()) {

if (node.isVisible()) {

filtered_leaves++;

}

}

});

3. Count all leaves that are visible if tree will be expanded (no matter whether these display on screen or not)

????

Tree Panel markup other than visible