Added ImGuiWindowFlags_NoInputs for input-passthru window

Would be more useful with finer control over display layer

imgui.cpp

@@ -2902,6 +2902,8 @@ static ImGuiWindow* FindHoveredWindow(ImVec2 pos, bool excluding_childs)
         ImGuiWindow* window = g.Windows[i];
         if (!window->Active)
             continue;
+        if (window->Flags & ImGuiWindowFlags_NoInputs)
+            continue;
         if (excluding_childs && (window->Flags & ImGuiWindowFlags_ChildWindow) != 0)
             continue;
 
@@ -3631,6 +3633,9 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
     IM_ASSERT(g.Initialized);                       // Forgot to call ImGui::NewFrame()
     IM_ASSERT(name != NULL);                        // Must pass a name
 
+    if (flags & ImGuiWindowFlags_NoInputs)
+        flags |= ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize;
+
     // Find or create
     bool window_is_new = false;
     ImGuiWindow* window = FindWindowByName(name);

imgui.h

@@ -434,7 +434,8 @@ enum ImGuiWindowFlags_
     ImGuiWindowFlags_AlwaysAutoResize       = 1 << 6,   // Resize every window to its content every frame
     ImGuiWindowFlags_ShowBorders            = 1 << 7,   // Show borders around windows and items
     ImGuiWindowFlags_NoSavedSettings        = 1 << 8,   // Never load/save settings in .ini file
-    ImGuiWindowFlags_MenuBar                = 1 << 9,   // Has a menu-bar
+    ImGuiWindowFlags_NoInputs               = 1 << 9,   // Disable catching mouse or keyboard inputs
+    ImGuiWindowFlags_MenuBar                = 1 << 10,  // Has a menu-bar
     // [Internal]
     ImGuiWindowFlags_ChildWindow            = 1 << 20,  // Don't use! For internal use by BeginChild()
     ImGuiWindowFlags_ChildWindowAutoFitX    = 1 << 21,  // Don't use! For internal use by BeginChild()