Fixed SizeContents and auto-fit size not being rounded to integer, which affects border rendering when using non-default font

imgui.cpp

@@ -3680,8 +3680,8 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
         // SIZE
 
         // Save contents size from last frame for auto-fitting (unless explicitly specified)
-        window->SizeContents.x = (window->SizeContentsExplicit.x != 0.0f) ? window->SizeContentsExplicit.x : ((window_is_new ? 0.0f : window->DC.CursorMaxPos.x - window->Pos.x) + window->Scroll.x);
-        window->SizeContents.y = (window->SizeContentsExplicit.y != 0.0f) ? window->SizeContentsExplicit.y : ((window_is_new ? 0.0f : window->DC.CursorMaxPos.y - window->Pos.y) + window->Scroll.y);
+        window->SizeContents.x = (float)(int)((window->SizeContentsExplicit.x != 0.0f) ? window->SizeContentsExplicit.x : ((window_is_new ? 0.0f : window->DC.CursorMaxPos.x - window->Pos.x) + window->Scroll.x));
+        window->SizeContents.y = (float)(int)((window->SizeContentsExplicit.y != 0.0f) ? window->SizeContentsExplicit.y : ((window_is_new ? 0.0f : window->DC.CursorMaxPos.y - window->Pos.y) + window->Scroll.y));
 
         // Hide popup/tooltip window when first appearing while we measure size (because we recycle them)
         if (window->HiddenFrames > 0)