From 0e96f1dfa0bbec6eb62ee2ed3e3fd4b01fbe3568 Mon Sep 17 00:00:00 2001
From: Scott Talbert <swt@techie.net>
Date: Thu, 27 Aug 2026 10:00:53 -0400
Subject: [PATCH] Add dummy sibling window in TextCtrlTestCase to avoid GTK
 lone-child sizing

Same issue as ClippingBoxTestCase::wxPaintDC: a sole child window gets
stretched to fill the parent under wxGTK, breaking HitTest() and the
multiline PositionToCoords* tests via a wrongly inflated allocation.
---
 tests/controls/textctrltest.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/controls/textctrltest.cpp b/tests/controls/textctrltest.cpp
index 4fe879ff42..68e0a640fe 100644
--- a/tests/controls/textctrltest.cpp
+++ b/tests/controls/textctrltest.cpp
@@ -118,6 +118,8 @@ protected:
 
     std::unique_ptr<wxTextCtrl> m_text;
 
+    std::unique_ptr<wxWindow> m_dummySibling;
+
     const long m_style;
 
     wxDECLARE_NO_COPY_CLASS(TextCtrlTestCase);
@@ -197,6 +199,7 @@ void TextCtrlTestCase::CreateText(long extraStyles)
 {
     const long style = m_style | extraStyles;
     const int h = (style & wxTE_MULTILINE) ? TEXT_HEIGHT : -1;
+    m_dummySibling = make_unique<wxWindow>(wxTheApp->GetTopWindow(), wxID_ANY);
     m_text = make_unique<wxTextCtrl>(wxTheApp->GetTopWindow(), wxID_ANY, "",
                                      wxDefaultPosition, wxSize(400, h),
                                      style);