4.3.1 (2025-09-03) Bug Fixes Disable some plugins when there is no data loaded into any relevant viewer, and fix tracebacks when unloading all data. [#3730] Distance measurement marks now update properly upon unit conversion. [#3716] Use validator on subset layer visibility and subset deletion to ensure toggling visibility and deleting subsets from data menu and plot options updates accordingly. [#3708] Fixed a bug in freezable state _set_zoom_radius_center where x/y_min/max values were calculated incorrectly when the viewer was rotated [#3731] Fixed issue in Rampviz where new loader infrastructure was unintentionally exposed. [#3740] Restrict polynomial order value of Polynomial1D model component to be >= 0. [#3741] When all data is unloaded from 1D Spectrum viewer, and new data is loaded, the unit setting in the unit conversion plugin from the initial dataset are maintained. [#3746] Cubeviz Fixed issue with initial model components not using spectral y axis unit. [#3715] Fixed reestimating model parameters when cube fitting in the case where the cube's first axis is the spectral axis. [#3717] Fixed issue with initializing model components when a spectral subset is selected and Cube Fit is toggled on. [#3727] Specviz2d Fix various bugs in the Line Analysis plugin, including some issues with spectral axis unit conversions and deletion of subsets. [#3746]

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