max / quasi

Budget the strip, so a long part stops eating what follows it The defect: `capped` gave a text leaf `max_width: ui.available_width()`, so a long primary took the whole row and the badge and the count after it started past the right edge and were clipped. Gone with no ellipsis and no sign they had ever been there. Now each part is drawn with the rest of the run reserved. What a part needs is measured in the frame that draws it, never remembered between frames: the standing promise is that the same description at the same width is the same picture, and a measurement carried over from a narrower frame is exactly how that stops being true. Measured rather than guessed, per widget. A token is its words plus token_padding on both sides, which is widget::token's own arithmetic; a control is a Button and really does take the style's button padding. Taking the button padding for both would have been close enough to look right and wrong enough to lose the last part in the run -- it was, for one commit. Anything this crate cannot measure makes the whole reservation None and no budget is claimed. A budget built on a guess about an unknown widget is worse than none: too small and the flexible part is elided for room nobody used. The reservation is only taken when it leaves something behind, which is quasi-tui's rule arriving from the other end. A budget that cannot fit the tail anyway would elide the one thing on screen to make room for parts that are still past the edge. The half that made all of this necessary and nearly silent: a Label re-lays a LayoutJob it is given, overwriting max_width with the Ui's available width. The budget was computed, passed, and then thrown away by egui. Laying the galley out here and building the Label from it is what makes what was measured be what is drawn.