Disabled: nested tooltips or other non-child window within a BeginDisabled() block disable the disabled state. (#211, #7640)

imgui_internal.h

@@ -2472,6 +2472,7 @@ struct IMGUI_API ImGuiWindowTempData
     bool                    NavWindowHasScrollY;    // Set per window when scrolling can be used (== ScrollMax.y > 0.0f)
 
     // Miscellaneous
+    bool                    BackupItemDisabled;     // Non-child window override disabled flag
     bool                    MenuBarAppending;       // FIXME: Remove this
     ImVec2                  MenuBarOffset;          // MenuBarOffset.x is sort of equivalent of a per-layer CursorPos.x, saved/restored as we switch to the menu bar. The only situation when MenuBarOffset.y is > 0 if when (SafeAreaPadding.y > FramePadding.y), often used on TVs.
     ImGuiMenuColumns        MenuColumns;            // Simplified columns storage for menu items measurement
@@ -3127,6 +3128,8 @@ namespace ImGui
     IMGUI_API void          PushItemFlag(ImGuiItemFlags option, bool enabled);
     IMGUI_API void          PopItemFlag();
     IMGUI_API const ImGuiDataVarInfo* GetStyleVarInfo(ImGuiStyleVar idx);
+    IMGUI_API void          BeginDisabledOverrideReenable();
+    IMGUI_API void          EndDisabledOverrideReenable();
 
     // Logging/Capture
     IMGUI_API void          LogBegin(ImGuiLogType type, int auto_open_depth);           // -> BeginCapture() when we design v2 api, for now stay under the radar by using the old name.