2092: Linux: first typed char lost when using dialog for label name

Fix: Move the insertion point to the end of the text after the dialog is shown.

src/widgets/ErrorDialog.cpp

@@ -239,6 +239,17 @@ extern wxString AudacityMessageBoxCaptionStr()
 
 void AudacityTextEntryDialog::SetInsertionPointEnd()
 {
-   // m_textctrl is protected member of wxTextEntryDialog
+   mSetInsertionPointEnd = true;
-   m_textctrl->SetInsertionPointEnd();
+}
+
+bool AudacityTextEntryDialog::Show(bool show)
+{
+   bool ret = wxTabTraversalWrapper< wxTextEntryDialog >::Show(show);
+
+   if (show && mSetInsertionPointEnd) {
+      // m_textctrl is protected member of wxTextEntryDialog
+      m_textctrl->SetInsertionPointEnd();
+   }
+
+   return ret;
 }

src/widgets/ErrorDialog.h

@@ -97,6 +97,10 @@ public:
    {}
    
    void SetInsertionPointEnd();
+   bool Show(bool show = true) override;
+
+private:
+   bool mSetInsertionPointEnd{};
 };
 
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