File 0001-spinctrl.patch of Package wxWidgets-3_0

commit c1cd1e01b51fc424cc200e718787ae1bb648094e
Author: Vadim Zeitlin <vadim@wxwidgets.org>
Date:   Sun Apr 3 17:11:09 2016 +0200

    Fix wxSpinCtrl best size calculation for GTK+ 3
    
    Don't hard code the width of spin buttons in wxGTK, this more or less worked
    for GTK+ 2 (at least with the default theme, it was perfectly possible that it
    also didn't work with some other ones), but not at all with GTK+ 3 where the
    buttons are much wider than the hardcoded value.
    
    Instead, do the same thing as wxSpinButton wxGTK implementation already does
    and force the GTK+ widget to compute its preferred size as we need it, i.e.
    without taking the text width into account, by forcing the width of the text
    entry to 0.
    
    Notice that for GTK+ 3.12+ we also need to set the max width to 0 as well to
    prevent the entry from making itself big enough for that many characters,
    see #17051.

diff --git a/src/gtk/spinctrl.cpp b/src/gtk/spinctrl.cpp
index 61c533a..c7067fd 100644
--- a/src/gtk/spinctrl.cpp
+++ b/src/gtk/spinctrl.cpp
@@ -362,24 +362,24 @@ wxSize wxSpinCtrlGTKBase::DoGetSizeFromTextSize(int xlen, int ylen) const
 {
     wxASSERT_MSG( m_widget, wxS("GetSizeFromTextSize called before creation") );
 
-    // Set an as small as possible size for the control, so preferred sizes
-    // return "natural" sizes, not taking into account the previous ones (which
-    // seems to be GTK+3 behaviour)
-    gtk_widget_set_size_request(m_widget, 0, 0);
-
-    // Both Gtk+2 and Gtk+3 use current value/range to measure control's width.
-    // So, we can't ask Gtk+ for its width. Instead, we used hardcoded values.
+    const gint widthChars = gtk_entry_get_width_chars(GTK_ENTRY(m_widget));
+    gtk_entry_set_width_chars(GTK_ENTRY(m_widget), 0);
+#if GTK_CHECK_VERSION(3,12,0)
+    gint maxWidthChars = 0;
+    if ( gtk_check_version(3,12,0) == NULL )
+    {
+        maxWidthChars = gtk_entry_get_max_width_chars(GTK_ENTRY(m_widget));
+        gtk_entry_set_max_width_chars(GTK_ENTRY(m_widget), 0);
+    }
+#endif // GTK+ 3.12+
 
-    // Returned height is OK
     wxSize totalS = GTKGetPreferredSize(m_widget);
 
-#if GTK_CHECK_VERSION(3,4,0)
-    // two buttons in horizontal
-    totalS.x = 46 + 15; // margins included
-#else
-    // two small buttons in vertical
-    totalS.x = GetFont().GetPixelSize().y + 13; // margins included
-#endif
+#if GTK_CHECK_VERSION(3,12,0)
+    if ( gtk_check_version(3,12,0) == NULL )
+        gtk_entry_set_max_width_chars(GTK_ENTRY(m_widget), maxWidthChars);
+#endif // GTK+ 3.12+
+    gtk_entry_set_width_chars(GTK_ENTRY(m_widget), widthChars);
 
     wxSize tsize(xlen + totalS.x, totalS.y);