File 0002-spinctrl.patch of Package wxWidgets-3_0

commit 7465237353f795bb9872aca688e9c19000a7a16d
Author: Vadim Zeitlin <vadim@wxwidgets.org>
Date:   Sun Apr 3 18:02:43 2016 +0200

    Improve wxSpinCtrl best size computation in wxGTK
    
    Don't hardcode completely arbitrary width of 95px for the text part, but
    compute it from the values this control is actually used for.

diff --git a/src/gtk/spinctrl.cpp b/src/gtk/spinctrl.cpp
index c7067fd..b33593c 100644
--- a/src/gtk/spinctrl.cpp
+++ b/src/gtk/spinctrl.cpp
@@ -355,7 +355,16 @@ GdkWindow *wxSpinCtrlGTKBase::GTKGetWindow(wxArrayGdkWindows& windows) const
 
 wxSize wxSpinCtrlGTKBase::DoGetBestSize() const
 {
-    return DoGetSizeFromTextSize(95); // TODO: 95 is completely arbitrary
+    const int minVal = static_cast<int>(DoGetMin());
+    const int lenMin = wxString::Format("%d", minVal).length();
+
+    const int maxVal = static_cast<int>(DoGetMax());
+    const int lenMax = wxString::Format("%d", maxVal).length();
+
+    wxString longestText(wxMax(lenMin, lenMax), '9');
+    if ( minVal < 0 )
+        longestText.insert(0, "-");
+    return DoGetSizeFromTextSize(GetTextExtent(longestText).x, -1);
 }
 
 wxSize wxSpinCtrlGTKBase::DoGetSizeFromTextSize(int xlen, int ylen) const