[Patch] inline boxes leak

[Germain Garand]

Hello,

Here is a patch intended to solve the problem of leaked placeholder boxes [1].

It replaces the deleteLineBoxes/deleteTextBoxes method with a single virtual 
named deleteInlineBoxes, that is the exact parallel to the 
createInlineBoxes method.

Sadly, each inline needing to be cleared by it's associated RenderObject at 
relayout time, I couldn't avoid a new member in RenderBox.

Also in the patch: a simplification of the Bidinext logic (no need to return 
each inline twice).

What do you think about it?

Germain

[1] Inline boxes acting as a "black box" container for replaced and positioned 
elements. They used to be merely detached just after layout, corrupting the 
inline tree in the process.
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