update dear imgui from 1.92.6-docking to 1.92.7-docking

libs/imgui/backends/imgui_impl_glfw.cpp

@@ -32,6 +32,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2026-03-25: Mouse cursor is properly restored if changed by user app/code while using glfwSetInputMode(..., GLFW_CURSOR_DISABLED) or ImGuiConfigFlags_NoMouseCursorChange. Amend change from 2025-12-10.
 //  2026-02-10: Try to set IMGUI_IMPL_GLFW_DISABLE_X11 / IMGUI_IMPL_GLFW_DISABLE_WAYLAND automatically if corresponding headers are not accessible. (#9225)
 //  2026-01-25: [Docking] Improve workarounds for cases where GLFW is unable to provide any reliable monitor info. Preserve existing monitor list when none of the new one is valid. (#9195, #7902, #5683)
 //  2026-01-18: [Docking] Dynamically load X11 functions to avoid -lx11 linking requirement introduced on 2025-09-10.
@@ -993,7 +994,10 @@ static void ImGui_ImplGlfw_UpdateMouseCursor()
     ImGuiIO& io = ImGui::GetIO();
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
     if ((io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) || glfwGetInputMode(bd->Window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED)
+    {
+        bd->LastMouseCursor = nullptr;  // Invalidate so that if user changes underlying cursor we will update it next time we can.
         return;
+    }
 
     ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();