Fix for refresh issue on several preference panes

See bug #2315, but this should be review and removed
after moving to wx3.1.3.

src/prefs/ExtImportPrefs.cpp

@@ -65,8 +65,11 @@ ExtImportPrefs::ExtImportPrefs(wxWindow * parent, wxWindowID winid)
     mFakeKeyEvent (false), mStopRecursiveSelection (false), last_selected (-1)
 {
    Populate();
-}
 
+   // See bug #2315 for discussion
+   // This should be reviewed and (possibly) removed after wx3.1.3.
+   Bind(wxEVT_SHOW, &ExtImportPrefs::OnShow, this);
+}
 ExtImportPrefs::~ExtImportPrefs()
 {
 }
@@ -213,6 +216,16 @@ bool ExtImportPrefs::Commit()
    return true;
 }
 
+// See bug #2315 for discussion. This should be reviewed
+// and (possibly) removed after wx3.1.3.
+void ExtImportPrefs::OnShow(wxShowEvent &event)
+{
+   event.Skip();
+
+   RuleTable->Refresh();
+   PluginList->Refresh();
+}
+
 void ExtImportPrefs::OnPluginKeyDown(wxListEvent& event)
 {
    for (int i = 0; i < 1; i++)

src/prefs/ExtImportPrefs.h

@@ -58,6 +58,10 @@ class ExtImportPrefs final : public PrefsPanel
    wxString HelpPageName() override;
    void PopulateOrExchange(ShuttleGui & S) override;
 
+   // See bug #2315 for discussion. This should be reviewed
+   // and (possibly) removed after wx3.1.3.
+   void OnShow(wxShowEvent& event);
+
    void OnPluginKeyDown(wxListEvent& event);
    void OnPluginBeginDrag(wxListEvent& event);
    void OnRuleTableKeyDown(wxKeyEvent& event);

src/prefs/KeyConfigPrefs.cpp

@@ -102,6 +102,10 @@ KeyConfigPrefs::KeyConfigPrefs(
       auto index = mView->GetIndexByName(name);
       mView->SelectNode(index);
    }
+
+   // See bug #2315 for discussion. This should be reviewed
+   // and (possibly) removed after wx3.1.3.
+   Bind(wxEVT_SHOW, &KeyConfigPrefs::OnShow, this);
 }
 
 ComponentInterfaceSymbol KeyConfigPrefs::GetSymbol()
@@ -459,6 +463,15 @@ TranslatableString KeyConfigPrefs::MergeWithExistingKeys(
    return disabledShortcuts;
 }
 
+// See bug #2315 for discussion. This should be reviewed
+// and (possibly) removed after wx3.1.3.
+void KeyConfigPrefs::OnShow(wxShowEvent & event)
+{
+   event.Skip();
+
+   mView->Refresh();
+}
+
 void KeyConfigPrefs::OnImport(wxCommandEvent & WXUNUSED(event))
 {
    wxString file = wxT("Audacity-keys.xml");

src/prefs/KeyConfigPrefs.h

@@ -56,6 +56,10 @@ private:
    CommandID NameFromKey(const NormalizedKeyString & key);
    void SetKeyForSelected(const NormalizedKeyString & key);
 
+   // See bug #2315 for discussion. This should be reviewed
+   // and (possibly) removed after wx3.1.3.
+   void OnShow(wxShowEvent & e);
+
    void OnViewBy(wxCommandEvent & e);
    void OnDefaults(wxCommandEvent & e);
    void OnImportDefaults(wxCommandEvent & e);

src/prefs/MousePrefs.cpp

@@ -64,6 +64,10 @@ MousePrefs::MousePrefs(wxWindow * parent, wxWindowID winid)
 :  PrefsPanel(parent, winid, XO("Mouse"))
 {
    Populate();
+
+   // See bug #2315 for discussion. This should be reviewed
+   // and (possibly) removed after wx3.1.3.
+   Bind(wxEVT_SHOW, &MousePrefs::OnShow, this);
 }
 
 MousePrefs::~MousePrefs()
@@ -211,6 +215,14 @@ void MousePrefs::AddItem(
    mList->SetItem(i, CommentColumn, wxT(" ") + comment.Translation());
 }
 
+// See bug #2315 for discussion. This should be reviewed
+// and (possibly) removed after wx3.1.3.
+void MousePrefs::OnShow(wxShowEvent &event)
+{
+   event.Skip();
+
+   mList->Refresh();
+}
 
 /// Update the preferences stored on disk.
 /// Currently does nothing as Mouse Preferences don't change.

src/prefs/MousePrefs.h

@@ -39,6 +39,10 @@ class MousePrefs final : public PrefsPanel
                 TranslatableString const & action,
                 TranslatableString const & comment = {});
 
+   // See bug #2315 for discussion. This should be reviewed
+   // and (possibly) removed after wx3.1.3.
+   void OnShow(wxShowEvent & event);
+
    wxListCtrl * mList;
 };