Avoid printing scrollbar overrun on emit callback

ChangeLog

@@ -1,3 +1,6 @@
+2023-04-04  Markus Gans  <guru.mail@muenster.de>
+	* Avoid printing scrollbar overrun on emit callback
+
 2023-04-02  Markus Gans  <guru.mail@muenster.de>
 	* Implementation of the mouse selection in the FTextView. Can be 
 	  activated by setSelectable()

final/widget/fscrollbar.cpp

@@ -763,8 +763,10 @@ void FScrollbar::avoidScrollOvershoot()
 //----------------------------------------------------------------------
 void FScrollbar::processScroll()
 {
+  startDrawing();  // Avoid printing an overshoot on the emit callback
   emitCallback("change-value");
   avoidScrollOvershoot();
+  finishDrawing();
 }
 
 //----------------------------------------------------------------------

final/widget/ftextview.cpp

@@ -121,7 +121,7 @@ auto FTextView::getSelectedText() const -> FString
       line = iter->text.toWString();
 
     if ( iter == last )
-      line = line.substr(0, end_col + 1);
+      line.resize(end_col + 1);
 
     selected_text += FString(line) + L'\n';  // Add newline character
     ++iter;

test/fkeyboard-test.cpp

@@ -3,7 +3,7 @@
 *                                                                      *
 * This file is part of the FINAL CUT widget toolkit                    *
 *                                                                      *
-* Copyright 2018-2023 Markus Gans                                      *
+* Copyright 2018-2024 Markus Gans                                      *
 *                                                                      *
 * FINAL CUT is free software; you can redistribute it and/or modify    *
 * it under the terms of the GNU Lesser General Public License as       *
@@ -330,7 +330,8 @@ class FKeyboardTest : public CPPUNIT_NS::TestFixture
     // End of test suite definition
     CPPUNIT_TEST_SUITE_END();
     void init();
-    void input (std::string);
+    template<typename CharT>
+    void input (CharT&&);
     void processInput();
     void clear();
     void keyPressed();
@@ -3183,14 +3184,16 @@ void FKeyboardTest::init()
 }
 
 //----------------------------------------------------------------------
-void FKeyboardTest::input (std::string s)
+template<typename CharT>
+void FKeyboardTest::input (CharT&& string)
 {
   // Simulates keystrokes
 
   const char EOT = 0x04;  // End of Transmission
   auto stdin_no = finalcut::FTermios::getStdIn();
   fflush(stdout);
 
+  std::string s = std::forward<CharT>(string);
   std::string::const_iterator iter;
   iter = s.begin();