882ed91f2f
Correctly divide the fractions of *available* requested child-space. This fixes issue with Trigger Page bottom attachment not showing Frame content. When calculating constraints the divider width/height was ignored. When setting child allocation, the divider girth was only subtracted *after* the first child, and iteratively subtracted after each subsequent child widget. This over-allocated the first child and later child widgets were increasingly too small (factor * remaining).
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