v0.15.0

Breaking Changes

• Safe handles and RAII tokens now clean up through the context that created them. This makes it supported to keep multiple ImGui, ImPlot, ImPlot3D, ImNodes, or ImGuizmo contexts alive and switch between them without stack cleanup, drawing, or post-frame queries accidentally targeting the wrong current context.
• Ui::push_font_with_size(...) now returns FontStackToken. Keep the token alive for the font scope and let it drop to pop the font. Fixes #31, thanks @spindlymist.
• Obsolete public manual pop/end helpers for stack scopes were removed. Use the returned RAII tokens instead.
• ImPlot item submission now takes the owner &PlotUi, for example LinePlot::new(...).plot(&plot_ui) and PlotBuilder::new(...).build(&plot_ui). Other context-dependent ImPlot APIs such as SubplotGrid::begin(...), MultiAxisPlot::begin(...), and LegendManager::{setup, begin_custom}(...) now take &PlotUi too.
• ImPlot and ImPlot3D style helpers moved onto PlotUi / Plot3DUi. Use plot_ui.push_style_*, plot_ui.push_colormap_*, plot_ui.with_next_plot_item_array_style(...), plot_ui.with_next_plot3d_item_array_style(...), and the Plot3DUi next-style setters instead of safe free functions.
• dear-imnodes removed deprecated post-frame query methods from active NodeEditor handles. Call let post = editor.end(); and then query post.selected_nodes(), post.is_link_created(), post.clear_selection(), and the other PostEditor helpers.

Added

• Added the multi_context_switch example showing how integrations can keep multiple contexts alive and switch between them with Context::suspend() / SuspendedContext::activate().

Fixed

• Destroying the current ImPlot or ImPlot3D context now clears the corresponding global current-context pointer instead of restoring a dangling pointer to the destroyed context.
• dear-imgui-bevy now keeps the scheduled ImGui frame open across Bevy systems until ImguiEndFrame, avoiding premature frame closure before platform feedback and rendering systems run.