Tables: Headers: fixed label being clipped early to reserve space for a sort marker even when no sort marker is displayed.

Amend 892b48e2d6: while fixing auto fit this was ditched.

docs/CHANGELOG.txt

diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index 4f600ed..eb1e842 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -58,6 +58,9 @@
 - Tables:
   - Context Menu: added a "Reset" sub-menu with a "Reset Visibility" option.
     (which is greyed out when using default settings)
+  - Headers: fixed label being clipped early to reserve space for a sort marker
+    even when no sort marker is displayed. Auto-fitting a column still accounts
+    for the possible marker, so that sorting after an auto-fit doesn't clip the label.
 - Fonts:
   - Added `IMGUI_DISABLE_DEFAULT_FONT_BITMAP`/`IMGUI_DISABLE_DEFAULT_FONT_VECTOR` to
     disable embedding either fonts separately. (#9407)

imgui_tables.cpp

diff --git a/imgui_tables.cpp b/imgui_tables.cpp
index a306a00..405f685 100644
--- a/imgui_tables.cpp
+++ b/imgui_tables.cpp
@@ -3288,7 +3288,9 @@
     }
 
     // Sort order arrow
-    const float ellipsis_max = ImMax(cell_r.Max.x - w_arrow - w_sort_text, label_pos.x);
+    // - Only clip label for a visible arrow. Auto-fit still accounts for a possible arrow, but when
+    //   manually sized smaller we don't clip the label for the sake of an arrow that isn't displayed.
+    const float ellipsis_max = ImMax(cell_r.Max.x - (sort_arrow ? w_arrow + w_sort_text : 0.0f), label_pos.x);
     if ((table->Flags & ImGuiTableFlags_Sortable) && !(column->Flags & ImGuiTableColumnFlags_NoSort))
     {
         if (column->SortOrder != -1)