Fix unwanted group orientation change when using mixed orientation #431
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Dragging a floating document into the top or bottom of another document that is in a horizontal layout causes an unexpected change in the layout group. This only happens when using AllowMixedOrientation as the placement is not allowed otherwise.
As you can see in this example, a tab was dragged from the right side onto the bottom of another document:

Which causes the whole layout to change:

With the changes from this pull request the document is placed in the expected position:
