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Replace the fixed SidePanel + implicit CentralPanel layout with an egui_tiles-managed horizontal split (Layers | Map). The map pane is transparent and passes input through to Bevy via a MapPaneRect resource. Mouse systems now check pointer position against the map pane rect instead of egui's is_pointer_over_area().
Use egui_tiles within a SidePanel instead of CentralPanel to avoid breaking map interaction (is_pointer_over_area) and transparency. Revert mouse/units changes that were needed for CentralPanel approach.
Make the map a tile pane alongside Layers in egui_tiles. Uses CentralPanel with Frame::NONE so Bevy renders behind the transparent Map pane. Adds MapPaneRect resource for mouse input handling since is_pointer_over_area() always returns true with CentralPanel.
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Summary
egui_tilesdependency and replace the fixedSidePanel+ implicitCentralPanelwith an egui_tiles-managed horizontal splitMapPaneRectresource inrgis-unitstracks the map pane's screen rectMapPaneRectinstead of egui'sis_pointer_over_area()(which would always be true with a CentralPanel)What this enables
With egui_tiles, the layout can eventually support:
Test plan