I see that you basically handle the fragmentation case as I suggested here:
>+ || IsTrueOverflowContainer() // nothing to shift
>+ || GetPrevInFlow() || !aState.mReflowStatus.IsFullyComplete()) {
>+ return;
FYI, I think the `IsTrueOverflowContainer()` is redundant since `GetPrevInFlow()` is always true for those.
Bug 1684236 Comment 4 Edit History
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I see that you basically handle the fragmentation case as I suggested here:
```
|| IsTrueOverflowContainer() // nothing to shift
|| GetPrevInFlow() || !aState.mReflowStatus.IsFullyComplete()) {
return;
```
FYI, I think the `IsTrueOverflowContainer()` is redundant since `GetPrevInFlow()` is always true for those.