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Fix: ScrollArea layout jitter with floating bars and zoom levels * Closes #7937 * Closes #7942 This PR improves the stability of `ScrollArea` by addressing two layout issues: 1. **Discrete Layout for Floating Bars:** Fixed content "shaking" in `floating` mode when a non-zero `allocated_width` is used. By using discrete visibility (`show_bars`) instead of the animated factor for space allocation, we ensure the layout remains stable during scrollbar animations. 2. **Zoom-level Stability:** Introduced a small epsilon (0.1) when checking if content exceeds the viewport. This prevents scrollbars from flickering on and off due to floating-point rounding errors at specific zoom factors (e.g., 1.01 or 0.95).