Docking: fixed ImGuiWindowFlags_DockNodeHost/ImGuiWindowFlags_NavFlattened clash introduced by c38c18c1a just for 1.91.7 (#8357)

docs/CHANGELOG.txt

@@ -108,6 +108,9 @@ Other changes:
 
 Docking+Viewports Branch:
 
+- Docking: Fixed an issue in 1.91.7 where using legacy ImGuiWindowFlags_NavFlattened
+  flag (instead of ImGuiChildFlags_NavFlattened) in docking branch would conflict
+  with internal docking flags. (#8357) [@DanielGibson]
 - Backends: SDL3: new viewport windows are created with the SDL_WINDOW_HIDDEN flag
   before calling SDL_ShowWindow(). (#8328) [@PathogenDavid]
 

imgui.h

@@ -1132,12 +1132,12 @@ enum ImGuiWindowFlags_
     ImGuiWindowFlags_NoInputs               = ImGuiWindowFlags_NoMouseInputs | ImGuiWindowFlags_NoNavInputs | ImGuiWindowFlags_NoNavFocus,
 
     // [Internal]
+    ImGuiWindowFlags_DockNodeHost           = 1 << 23,  // Don't use! For internal use by Begin()/NewFrame()
     ImGuiWindowFlags_ChildWindow            = 1 << 24,  // Don't use! For internal use by BeginChild()
     ImGuiWindowFlags_Tooltip                = 1 << 25,  // Don't use! For internal use by BeginTooltip()
     ImGuiWindowFlags_Popup                  = 1 << 26,  // Don't use! For internal use by BeginPopup()
     ImGuiWindowFlags_Modal                  = 1 << 27,  // Don't use! For internal use by BeginPopupModal()
     ImGuiWindowFlags_ChildMenu              = 1 << 28,  // Don't use! For internal use by BeginMenu()
-    ImGuiWindowFlags_DockNodeHost           = 1 << 29,  // Don't use! For internal use by Begin()/NewFrame()
 
     // Obsolete names
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS