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01c0cb020e
- I used AI to assist in research of the focal point computation formulae for OnEdge and Centered modes. - I used the formulas found in [KDE's zoom magnifier](https://invent.kde.org/plasma/kwin/-/blob/master/src/plugins/zoom/zoom.cpp) and converted them to Rust and the COSMIC focal point system. - Remove unnecessary focal-point precomputation in `OutputZoomState::new`, because it is now updated on first zoom in anyway. - Do focal point computation in Local coordinates in update_focal_point to eliminate local-global conversion confusion/ issues. - ZoomMovement::OnEdge - single code path rewrite - old two-branch logic caused jumping and unpredictability at high zoom. Fixes [#2683](https://github.com/pop-os/cosmic-epoch/issues/2683), partially addresses [#2688](https://github.com/pop-os/cosmic-epoch/issues/2688). - ZoomMovement::Centered - translation/clamp/invert - prevents "blow up" of calculation at zoom level > 2.0 that caused cursor to disappear off bottom right of screen. Fixes [#1503](https://github.com/pop-os/cosmic-comp/issues/1503). - `is_level_change` - sets `previous_point` so that `animating_focal_point` interpolates instead of jumping. Still room for improvement (needs focal point recomputation per-frame during animation to prevent "boomerang" feel), but this is still an improvement over jumping. - In `trigger_zoom`, call `update_focal_point` when `level > 1.0` - overlaps proposal in [#1859](https://github.com/pop-os/cosmic-comp/pull/1859) + the level gate to prevent stale focal point on zoom in. Fixes [#2511](https://github.com/pop-os/cosmic-comp/issues/2511) and [#1883](https://github.com/pop-os/cosmic-epoch/issues/1883). Partially addresses [#1420](https://github.com/pop-os/cosmic-comp/issues/1420) (item 1 only). |
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