Tables: removed hot RequestOutputMaskByIndex bit-array as majority of code-paths are already touching the cold parts.

Only exception being TableSetColumnIndex() with same column number but that's an odd case.
Will break PR #6094 #3572 #5305 #4876 but those not need to be necessarily updated: we got enough reference to finish that feature.

imgui_internal.h

@@ -2538,7 +2538,6 @@ struct IMGUI_API ImGuiTable
     ImU64                       EnabledMaskByDisplayOrder;  // Column DisplayOrder -> IsEnabled map
     ImU64                       EnabledMaskByIndex;         // Column Index -> IsEnabled map (== not hidden by user/api) in a format adequate for iterating column without touching cold data
     ImU64                       VisibleMaskByIndex;         // Column Index -> IsVisibleX|IsVisibleY map (== not hidden by user/api && not hidden by scrolling/cliprect)
-    ImU64                       RequestOutputMaskByIndex;   // Column Index -> IsVisible || AutoFit (== expect user to submit items)
     ImGuiTableFlags             SettingsLoadedFlags;        // Which data were loaded from the .ini file (e.g. when order is not altered we won't save order)
     int                         SettingsOffset;             // Offset in g.SettingsTables
     int                         LastFrameActive;

imgui_tables.cpp

@@ -860,7 +860,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
             // Latch initial size for fixed columns and update it constantly for auto-resizing column (unless clipped!)
             if (column->AutoFitQueue != 0x00)
                 column->WidthRequest = width_auto;
-            else if ((column->Flags & ImGuiTableColumnFlags_WidthFixed) && !column_is_resizable && (table->RequestOutputMaskByIndex & ((ImU64)1 << column_n)))
+            else if ((column->Flags & ImGuiTableColumnFlags_WidthFixed) && !column_is_resizable && column->IsRequestOutput)
                 column->WidthRequest = width_auto;
 
             // FIXME-TABLE: Increase minimum size during init frame to avoid biasing auto-fitting widgets
@@ -967,7 +967,6 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
     ImRect host_clip_rect = table->InnerClipRect;
     //host_clip_rect.Max.x += table->CellPaddingX + table->CellSpacingX2;
     table->VisibleMaskByIndex = 0x00;
-    table->RequestOutputMaskByIndex = 0x00;
     for (int order_n = 0; order_n < table->ColumnsCount; order_n++)
     {
         const int column_n = table->DisplayOrderToIndex[order_n];
@@ -1041,8 +1040,6 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
 
         // Mark column as requesting output from user. Note that fixed + non-resizable sets are auto-fitting at all times and therefore always request output.
         column->IsRequestOutput = is_visible || column->AutoFitQueue != 0 || column->CannotSkipItemsQueue != 0;
-        if (column->IsRequestOutput)
-            table->RequestOutputMaskByIndex |= ((ImU64)1 << column_n);
 
         // Mark column as SkipItems (ignoring all items/layout)
         column->IsSkipItems = !column->IsEnabled || table->HostSkipItems;
@@ -1926,7 +1923,7 @@ bool ImGui::TableSetColumnIndex(int column_n)
 
     // Return whether the column is visible. User may choose to skip submitting items based on this return value,
     // however they shouldn't skip submitting for columns that may have the tallest contribution to row height.
-    return (table->RequestOutputMaskByIndex & ((ImU64)1 << column_n)) != 0;
+    return table->Columns[column_n].IsRequestOutput;
 }
 
 // [Public] Append into the next column, wrap and create a new row when already on last column
@@ -1951,8 +1948,7 @@ bool ImGui::TableNextColumn()
 
     // Return whether the column is visible. User may choose to skip submitting items based on this return value,
     // however they shouldn't skip submitting for columns that may have the tallest contribution to row height.
-    int column_n = table->CurrentColumn;
-    return (table->RequestOutputMaskByIndex & ((ImU64)1 << column_n)) != 0;
+    return table->Columns[table->CurrentColumn].IsRequestOutput;
 }