Fixed dropdown arrow display bug on Linux.

src/data/field.cpp

@@ -115,7 +115,7 @@ bool Style::update(Context& ctx) {
 }
 
 void Style::initDependencies(Context& ctx, const Dependency& dep) const {
-///	left   .initDependencies(ctx,dep);
+//	left   .initDependencies(ctx,dep);
 //	top    .initDependencies(ctx,dep);
 //	width  .initDependencies(ctx,dep);
 //	height .initDependencies(ctx,dep);

src/gui/control/native_look_editor.cpp

@@ -72,7 +72,7 @@ void NativeLookEditor::resizeViewers() {
 		y += s->height + vspace;
 	}
 	SetVirtualSize(w, (int)y);
-	SetScrollbar(wxVERTICAL, 0, h, (int) y);
+	SetScrollbar(wxVERTICAL, 0, h, (int)y);
 	if (y >= h) {
 		// Doesn't fit vertically, add scrollbar and resize
 		/*

src/gui/util.cpp

@@ -194,6 +194,9 @@ void draw_menu_arrow(Window* win, DC& dc, const wxRect& rect, bool active) {
 void draw_drop_down_arrow(Window* win, DC& dc, const wxRect& rect, bool active) {
 	wxRendererNative& rn = wxRendererNative::GetDefault();
 	int w = wxSystemSettings::GetMetric(wxSYS_VSCROLL_ARROW_X); // drop down arrow is same size
+	if (w == -1) {
+		w = wxSystemSettings::GetMetric(wxSYS_VSCROLL_X); // Try just the scrollbar, then.
+	}
 	rn.DrawComboBoxDropButton(win, dc, 
 		wxRect(rect.x + rect.width - w, rect.y, w, rect.height)
 		, active ? wxCONTROL_PRESSED : 0);