Tables: made TableUpdateBorders() use IsVisibleX flag. comments.

imgui_internal.h

@@ -2066,8 +2066,8 @@ struct ImGuiTableColumn
     ImGuiTableColumnIdx     NextEnabledColumn;              // Index of next enabled/visible column within Columns[], -1 if last enabled/visible column
     ImGuiTableColumnIdx     SortOrder;                      // Index of this column within sort specs, -1 if not sorting on this column, 0 for single-sort, may be >0 on multi-sort
     ImGuiTableDrawChannelIdx DrawChannelCurrent;            // Index within DrawSplitter.Channels[]
-    ImGuiTableDrawChannelIdx DrawChannelFrozen;
+    ImGuiTableDrawChannelIdx DrawChannelFrozen;             // Draw channels for frozen rows (often headers)
-    ImGuiTableDrawChannelIdx DrawChannelUnfrozen;
+    ImGuiTableDrawChannelIdx DrawChannelUnfrozen;           // Draw channels for unfrozen rows
     bool                    IsEnabled;                      // Is the column not marked Hidden by the user? (even if off view, e.g. clipped by scrolling).
     bool                    IsEnabledNextFrame;
     bool                    IsVisibleX;                     // Is actually in view (e.g. overlapping the host window clipping rectangle, not scrolled).

imgui_tables.cpp

@@ -1164,8 +1164,7 @@ void ImGui::TableUpdateBorders(ImGuiTable* table)
         if ((table->Flags & ImGuiTableFlags_NoBordersInBody) && table->IsUsingHeaders == false)
             continue;
 
-        if (table->FreezeColumnsCount > 0)
+        if (!column->IsVisibleX && table->LastResizedColumn != column_n)
-            if (column->MaxX < table->Columns[table->DisplayOrderToIndex[table->FreezeColumnsCount - 1]].MaxX)
             continue;
 
         ImGuiID column_id = TableGetColumnResizeID(table, column_n, table->InstanceCurrent);