Columns: Make sure the ClipRect is valid. (#3475)

docs/CHANGELOG.txt

@@ -64,6 +64,8 @@ Other Changes:
 - Tab Bar: Keep tab item close button visible while dragging a tab (independent of hovering state).
 - Tab Bar: Fixed a small bug where toggling a tab bar from Reorderable to not Reorderable would leave
   tabs reordered in the tab list popup. [@Xipiryon]
+- Columns: Fix inverted ClipRect being passed to renderer when using certain primitives inside of
+  a fully clipped column. (#3475) [@szreder]
 - Metrics: Various tweaks, listing windows front-to-back, greying inactive items when possible.
 - Demo: Add simple InputText() callbacks demo (aside from the more elaborate ones in 'Examples->Console').
 - Backends: Vulkan: Some internal refactor aimed at allowing multi-viewport feature to create their

imgui_widgets.cpp

@@ -7938,7 +7938,7 @@ void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiColumnsFlag
         float clip_x1 = IM_ROUND(window->Pos.x + GetColumnOffset(n));
         float clip_x2 = IM_ROUND(window->Pos.x + GetColumnOffset(n + 1) - 1.0f);
         column->ClipRect = ImRect(clip_x1, -FLT_MAX, clip_x2, +FLT_MAX);
-        column->ClipRect.ClipWith(window->ClipRect);
+        column->ClipRect.ClipWithFull(window->ClipRect);
     }
 
     if (columns->Count > 1)