Add support for wxALWAYS_SHOW_SB style to wxScrolled<>.

Simply call ShowScrollbars(wxSHOW_SB_ALWAYS) if this style is specified.

Closes #13616.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72621 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -563,6 +563,7 @@ All (GUI):
 - Add wxStyledTextCtrl::AnnotationClearLine() (sentieshar).
 - Add support for background-color style to span element in wxHTML (gevorg).
 - Add "inherit" to <font> XRC tag (Steffen Olszewski, Gero Meßsysteme GmbH).
+- Add support for wxALWAYS_SHOW_SB style to wxScrolled<> (Catalin Raceanu).
 
 wxGTK:
 

include/wx/scrolwin.h

@@ -384,6 +384,9 @@ public:
         if ( !(style & (wxHSCROLL | wxVSCROLL)) )
             style |= wxHSCROLL | wxVSCROLL;
 
+        if ( style & wxALWAYS_SHOW_SB )
+            ShowScrollbars(wxSHOW_SB_ALWAYS, wxSHOW_SB_ALWAYS);
+
         return T::Create(parent, winid, pos, size, style, name);
     }
 

interface/wx/scrolwin.h

@@ -109,6 +109,9 @@ enum wxScrollbarVisibility
            scrollable only in vertical direction (by default, i.e. if neither
            this style nor ::wxHSCROLL is specified, it scrolls in both
            directions).
+    @style{wxALWAYS_SHOW_SB}
+           Since wxWidgets 2.9.5, specifying this style makes the window always
+           show its scrollbars, even if they are not used. See ShowScrollbars().
     @style{wxRETAINED}
            Uses a backing pixmap to speed refreshes. Motif only.
     @endStyleTable