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`subsume_assets` fails to correctly subsume two instances of
`AssetsInHolding` under certain conditions which can result in loss of
funds (as assets are overriden rather than summed together)
Eg. consider following test:
```
#[test]
fn subsume_assets_different_length_holdings() {
let mut t1 = AssetsInHolding::new();
t1.subsume(CFP(400));
let mut t2 = AssetsInHolding::new();
t2.subsume(CF(100));
t2.subsume(CFP(100));
t1.subsume_assets(t2);
```
current result (without this PR change):
```
let mut iter = t1.into_assets_iter();
assert_eq!(Some(CF(100)), iter.next());
assert_eq!(Some(CFP(100)), iter.next());
```
expected result:
```
let mut iter = t1.into_assets_iter();
assert_eq!(Some(CF(100)), iter.next());
assert_eq!(Some(CFP(500)), iter.next());
```
---------
Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Branislav Kontur <[email protected]>
(cherry picked from commit 069b7b5)
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karolk91
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bkontur
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