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As the comment in the moved hunk said, a floating first letter frame's incomplete status means that there is more content to be reflowed on the line. If the block containing the floating first letter has `break-inside:avoid` style, the old code would call `SetInlineLineBreakBeforeAndReset()`, and the block's parent frame would misinterpret the status as "this block needs to be push to the next fragment" even if we are *not* in a paginated environment. Hence the assertion "Shouldn't be incomplete if availableBSize is UNCONSTRAINED." To fix this bug, we can reset the float's reflow status for a first letter frame before checking `ShouldAvoidBreakInside`. Differential Revision: https://phabricator.services.mozilla.com/D149712
