A right-to-left single-char sel followed by typing leaves cursor the same.

Fixes https://gitlab.com/kicad/code/kicad/issues/11349

common/scintilla_tricks.cpp

@@ -37,6 +37,8 @@ SCINTILLA_TRICKS::SCINTILLA_TRICKS( wxStyledTextCtrl* aScintilla, const wxString
         m_te( aScintilla ),
         m_braces( aBraces ),
         m_lastCaretPos( -1 ),
+        m_lastSelStart( -1 ),
+        m_lastSelEnd( -1 ),
         m_suppressAutocomplete( false ),
         m_singleLine( aSingleLine ),
         m_returnCallback( aReturnCallback )
@@ -337,10 +339,14 @@ void SCINTILLA_TRICKS::onScintillaUpdateUI( wxStyledTextEvent& aEvent )
 
     // Has the caret changed position?
     int caretPos = m_te->GetCurrentPos();
+    int selStart = m_te->GetSelectionStart();
+    int selEnd = m_te->GetSelectionEnd();
 
-    if( m_lastCaretPos != caretPos )
+    if( m_lastCaretPos != caretPos || m_lastSelStart != selStart || m_lastSelEnd != selEnd )
     {
         m_lastCaretPos = caretPos;
+        m_lastSelStart = selStart;
+        m_lastSelEnd = selEnd;
         int bracePos1 = -1;
         int bracePos2 = -1;
 

include/scintilla_tricks.h

@@ -1,7 +1,7 @@
 /*
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
- * Copyright (C) 2020 KiCad Developers, see change_log.txt for contributors.
+ * Copyright (C) 2020-2022 KiCad Developers, see change_log.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -56,6 +56,8 @@ protected:
     wxStyledTextCtrl*     m_te;
     wxString              m_braces;
     int                   m_lastCaretPos;
+    int                   m_lastSelStart;
+    int                   m_lastSelEnd;
     bool                  m_suppressAutocomplete;
     bool                  m_singleLine;            // Treat <return> as OK, and skip special tab
                                                    //  stop handling (including monospaced font).