Tables, Multi-Select: Fixed an issue using Multi-Select within a Table causing column width measurement to be invalid when trailing column contents is not submitted in the last row. (#9341, #8250)

docs/CHANGELOG.txt

@@ -59,6 +59,8 @@ Other Changes:
   - Child windows with only ImGuiChildFlags_AutoResizeY flag keep using the proportional
     default ItemWidth. (#9355)
 - Multi-Select:
+  - Fixed an issue using Multi-Select within a Table causing column width measurement to
+    be invalid when trailing column contents is not submitted in the last row. (#9341, #8250)
   - Box-Select: fixed an issue using ImGuiMultiSelectFlags_BoxSelect2d mode, where
     items out of view wouldn't be properly selected while scrolling while mouse cursor
     is hovering outside of selection scope. (#7994, #1861, #6518)

imgui_widgets.cpp

@@ -7917,6 +7917,7 @@ static ImRect CalcScopeRect(ImGuiMultiSelectTempData* ms, ImGuiWindow* window)
     if (ms->Flags & ImGuiMultiSelectFlags_ScopeRect)
     {
         // Warning: this depends on CursorMaxPos so it means to be called by EndMultiSelect() only
+        // This probably doesn't work inside a table as there are ample ambiguities related to exact time of calling BeginMultiSelect()/EndMultiSelect().
         return ImRect(ms->ScopeRectMin, ImMax(window->DC.CursorMaxPos, ms->ScopeRectMin));
     }
     else
@@ -7974,7 +7975,7 @@ ImGuiMultiSelectIO* ImGui::BeginMultiSelect(ImGuiMultiSelectFlags flags, int sel
     ms->Flags = flags;
     ms->IsFocused = (ms->FocusScopeId == g.NavFocusScopeId);
     ms->BackupCursorMaxPos = window->DC.CursorMaxPos;
-    ms->ScopeRectMin = window->DC.CursorMaxPos = window->DC.CursorPos;
+    ms->ScopeRectMin = window->DC.CursorMaxPos = window->DC.CursorPos; // CalcScopeRect() for ImGuiMultiSelectFlags_ScopeRect will measure in EndMultiSelect().
     PushFocusScope(ms->FocusScopeId);
     if (flags & ImGuiMultiSelectFlags_ScopeWindow) // Mark parent child window as navigable into, with highlight. Assume user will always submit interactive items.
         window->DC.NavLayersActiveMask |= 1 << ImGuiNavLayer_Main;
@@ -8129,10 +8130,13 @@ ImGuiMultiSelectIO* ImGui::EndMultiSelect()
     if (ms->Flags & ImGuiMultiSelectFlags_NavWrapX)
     {
         IM_ASSERT(ms->Flags & ImGuiMultiSelectFlags_ScopeWindow); // Only supported at window scope
-        ImGui::NavMoveRequestTryWrapping(ImGui::GetCurrentWindow(), ImGuiNavMoveFlags_WrapX);
+        NavMoveRequestTryWrapping(GetCurrentWindow(), ImGuiNavMoveFlags_WrapX);
     }
 
     // Unwind
+    if (ImGuiTable* table = g.CurrentTable)
+        if (table->IsInsideRow)
+            TableEndRow(table);
     window->DC.CursorMaxPos = ImMax(ms->BackupCursorMaxPos, window->DC.CursorMaxPos);
     PopFocusScope();