MultiSelect: Box-Select + Tables: Amend ac88294. fix usage of box-selection columns with items straying out of columns. (#7994, #2221)

imgui.cpp

diff --git a/imgui.cpp b/imgui.cpp
index 188b53d..1d23646 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -13349,7 +13349,7 @@
     const ImGuiID id = g.LastItemData.ID;
     const ImGuiItemFlags item_flags = g.LastItemData.ItemFlags;
 
-    // When inside a container that isn't scrollable with Left<>Right, clip NavRect accordingly (#2221, #8816)
+    // When inside a container that isn't scrollable with Left<>Right, clip NavRect accordingly (#2221, #8816, #7994)
     ImRect nav_bb = g.LastItemData.NavRect;
     if (window->DC.NavIsScrollPushableX == false)
     {

imgui_widgets.cpp

diff --git a/imgui_widgets.cpp b/imgui_widgets.cpp
index 9eb0076..d26e407 100644
--- a/imgui_widgets.cpp
+++ b/imgui_widgets.cpp
@@ -8359,12 +8359,16 @@
         if (ImGuiBoxSelectState* bs = GetBoxSelectState(ms->BoxSelectId))
         {
             ImRect item_rect = g.LastItemData.Rect;
-            if (!window->DC.NavIsScrollPushableX)
-            {
-                const ImRect& clip_rect = (g.LastItemData.StatusFlags & ImGuiItemStatusFlags_HasClipRect) ? g.LastItemData.ClipRect : window->ClipRect;
-                item_rect.Min.x = ImMax(item_rect.Min.x, clip_rect.Min.x);
-                item_rect.Max.x = ImMin(item_rect.Max.x, clip_rect.Max.x);
-            }
+            if (!window->DC.NavIsScrollPushableX) // FIXME: Rename to be more generic.
+                if (ImGuiTable* table = g.CurrentTable)
+                    if (table->CurrentColumn != -1)
+                    {
+                        // FIXME: We cannot use current ClipRect as it includes HostClipRect.
+                        // A more generic version would be nice, but window->WorkRect.Min/Max exclude CellPadding. (#7994)
+                        ImGuiTableColumn* column = &table->Columns[table->CurrentColumn];
+                        item_rect.Min.x = ImMax(item_rect.Min.x, column->MinX);
+                        item_rect.Max.x = ImMin(item_rect.Max.x, column->MaxX);
+                    }
             const bool rect_overlap_curr = bs->BoxSelectRectCurr.Overlaps(item_rect);
             const bool rect_overlap_prev = bs->BoxSelectRectPrev.Overlaps(item_rect);
             if ((rect_overlap_curr && !rect_overlap_prev && !selected) || (rect_overlap_prev && !rect_overlap_curr))