Fix wxInfoBar close button size in high DPI

Don't apply the scaling factor twice when dynamically creating the close
button bitmap.

Closes https://github.com/wxWidgets/wxWidgets/pull/1063

Closes #18283.

docs/changes.txt

@@ -102,6 +102,14 @@ Changes in behaviour which may result in build errors
   removing its name.
 
 
+3.1.3: (released 2019-??-??)
+----------------------------
+
+All (GUI):
+
+- Fix wxInfoBar close button size in high DPI (Stefan Ziegler).
+
+
 3.1.2: (released 2018-12-10)
 ----------------------------
 

src/common/bmpbtncmn.cpp

@@ -103,13 +103,13 @@ GetCloseButtonBitmap(wxWindow *win,
                      const wxColour& colBg,
                      int flags = 0)
 {
+    // size is physical here because it comes from wxArtProvider::GetSizeHint
     wxBitmap bmp;
-    bmp.CreateScaled(size.x, size.y, wxBITMAP_SCREEN_DEPTH, win->GetContentScaleFactor());
+    bmp.Create(size.x, size.y, wxBITMAP_SCREEN_DEPTH);
     wxMemoryDC dc(bmp);
     dc.SetBackground(colBg);
     dc.Clear();
-    wxRendererNative::Get().
-        DrawTitleBarBitmap(win, dc, win->FromDIP(size), wxTITLEBAR_BUTTON_CLOSE, flags);
+    wxRendererNative::Get().DrawTitleBarBitmap(win, dc, size, wxTITLEBAR_BUTTON_CLOSE, flags);
     return bmp;
 }