FIX: remove some warnings

jira: [none]
Change-Id: I0e74b7316d0efe38c65e1f695b2a09eb09103552
(cherry picked from commit 766c6e004145325bcc7a6addfce27842ee9504de)

src/slic3r/GUI/Widgets/AMSItem.cpp

@@ -364,11 +364,11 @@ void AMSrefresh::create(wxWindow *parent, wxWindowID id, const wxPoint &pos, con
 
     m_playing_timer = new wxTimer();
     m_playing_timer->SetOwner(this);
-    wxPostEvent(this, wxTimerEvent());
 
     SetSize(AMS_REFRESH_SIZE);
     SetMinSize(AMS_REFRESH_SIZE);
     SetMaxSize(AMS_REFRESH_SIZE);
+    Refresh();
 }
 
 void AMSrefresh::on_timer(wxTimerEvent &event)

src/slic3r/GUI/Widgets/DropDown.cpp

@@ -423,7 +423,7 @@ int DropDown::hoverIndex()
         return hover_item;
     int index = -1;
     std::set<wxString> groups;
-    for (size_t i = 0; i < items.size(); ++i) {
+    for (int i = 0; i < items.size(); ++i) {
         auto &item = items[i];
         // Skip by group
         if (group.IsEmpty()) {

src/slic3r/GUI/Widgets/StateColor.cpp

@@ -190,7 +190,6 @@ inline wxColour darkModeColorFor2(wxColour const &color)
     if (!gDarkMode)
         return color;
     auto iter = gDarkColors.find(color);
-    wxASSERT(iter != gDarkColors.end());
     if (iter != gDarkColors.end()) return iter->second;
     return color;
 }
@@ -206,7 +205,6 @@ wxColour StateColor::lightModeColorFor(wxColour const &color)
 {
     static std::map<wxColour, wxColour> gLightColors = revert(gDarkColors);
     auto iter = gLightColors.find(color);
-    wxASSERT(iter != gLightColors.end());
     if (iter != gLightColors.end()) return iter->second;
     return color;
 }

src/slic3r/GUI/Widgets/StateHandler.cpp

@@ -35,7 +35,7 @@ void StateHandler::attach_child(wxWindow *child)
 
 void StateHandler::remove_child(wxWindow *child)
 {
-    children_.erase(std::remove_if(children_.begin(), children_.end(), 
+    children_.erase(std::remove_if(children_.begin(), children_.end(),
             [child](auto &c) { return c->owner_ == child; }), children_.end());
     states2_ = 0;
     for (auto & c : children_) states2_ |= c->states();