InputTextMultiline(): fixed a minor bug where Shift+Wheel would allow a small horizontal scroll offset. (#9249)

diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index 19a9e72..4967e46 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt

@@ -168,6 +168,8 @@
     next to each components, in multi-components functions.
   - Added a way to select a specific marker color.
 - InputText:
+  - InputTextMultiline(): fixed a minor bug where Shift+Wheel would allow a small
+    horizontal scroll offset when there should be none. (#9249)
   - ImGuiInputTextCallbackData: SelectAll() also sets CursorPos to SelectionEnd.
   - ImGuiInputTextCallbackData: Added SetSelection() helper.
   - ImGuiInputTextCallbackData: Added ID and EventActive helpers. (#9174)

diff --git a/imgui_widgets.cpp b/imgui_widgets.cpp
index 3309aea..9fb5c2f 100644
--- a/imgui_widgets.cpp
+++ b/imgui_widgets.cpp

@@ -5400,7 +5400,6 @@
     }
 
     ImVec2 draw_pos = is_multiline ? draw_window->DC.CursorPos : frame_bb.Min + style.FramePadding;
-    ImVec2 text_size(0.0f, 0.0f);
     ImRect clip_rect(frame_bb.Min.x, frame_bb.Min.y, frame_bb.Min.x + inner_size.x, frame_bb.Min.y + inner_size.y); // Not using frame_bb.Max because we have adjusted size
     if (is_multiline)
         clip_rect.ClipWith(draw_window->ClipRect);
@@ -5458,7 +5457,7 @@
     line_visible_n1 = ImMin(line_visible_n1, line_count);
 
     // Store text height (we don't need width)
-    text_size = ImVec2(inner_size.x, line_count * g.FontSize);
+    float text_size_y = line_count * g.FontSize;
     //GetForegroundDrawList()->AddRect(draw_pos + ImVec2(0, line_visible_n0 * g.FontSize), draw_pos + ImVec2(frame_size.x, line_visible_n1 * g.FontSize), IM_COL32(255, 0, 0, 255));
 
     // Calculate blinking cursor position
@@ -5518,7 +5517,7 @@
         }
         if (new_scroll_y != scroll_y)
         {
-            const float scroll_max_y = ImMax((text_size.y + style.FramePadding.y * 2.0f) - inner_size.y, 0.0f);
+            const float scroll_max_y = ImMax((text_size_y + style.FramePadding.y * 2.0f) - inner_size.y, 0.0f);
             scroll_y = ImClamp(new_scroll_y, 0.0f, scroll_max_y);
             draw_pos.y += (draw_window->Scroll.y - scroll_y);   // Manipulate cursor pos immediately avoid a frame of lag
             draw_window->Scroll.y = scroll_y;
@@ -5611,7 +5610,7 @@
     if (is_multiline)
     {
         // For focus requests to work on our multiline we need to ensure our child ItemAdd() call specifies the ImGuiItemFlags_Inputable (see #4761, #7870)...
-        Dummy(ImVec2(text_size.x, text_size.y + style.FramePadding.y));
+        Dummy(ImVec2(0.0f, text_size_y + style.FramePadding.y));
         g.NextItemData.ItemFlags |= (ImGuiItemFlags)ImGuiItemFlags_Inputable | ImGuiItemFlags_NoTabStop;
         EndChild();
         item_data_backup.StatusFlags |= (g.LastItemData.StatusFlags & ImGuiItemStatusFlags_HoveredWindow);