Fix popup positioning, broken by 84e6fe4. (#3991, #3982)

imgui.cpp

@@ -6226,6 +6226,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         // UPDATE CONTENTS SIZE, UPDATE HIDDEN STATUS
 
         // Update contents size from last frame for auto-fitting (or use explicit size)
+        const bool window_just_appearing_after_hidden_for_resize = (window->HiddenFramesCannotSkipItems > 0);
         CalcWindowContentSizes(window, &window->ContentSize, &window->ContentSizeIdeal);
 
         // FIXME: These flags are decremented before they are used. This means that in order to have these fields produce their intended behaviors
@@ -6367,7 +6368,6 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
                 window->Pos = parent_window->DC.CursorPos;
         }
 
-        const bool window_just_appearing_after_hidden_for_resize = (window->HiddenFramesCannotSkipItems > 0);
         const bool window_pos_with_pivot = (window->SetWindowPosVal.x != FLT_MAX && window->HiddenFramesCannotSkipItems == 0);
         if (window_pos_with_pivot)
             SetWindowPos(window, window->SetWindowPosVal - window->Size * window->SetWindowPosPivot, 0); // Position given a pivot (e.g. for centering)