Add preference for terminal windows buffer size (bug #41474) * QTerminal.cc (notice_settings): call new function SetScrollBufferSize with the related value from the settings * QTerminal.h: new purely virtual function SetScrollBufferSize * QUnixTerminalImpl.cpp (initialize): corrections of coding style; (setScrollBufferSize): implementation of new function; * QUnixTerminalImpl.h: new function setScrollBufferSize; * QWinTerminalImpl.cpp (class QConsolePrivate): new function (QConsolePrivate::setScrollBufferSize): implementation of new function; (QWinTerminalImpl::setScrollBufferSize): implementation of new function; * QWinTerminalImpl.h: new function setScrollBufferSize; * settings-dialog.cc (constructor): init spinbox with buffer size from settings; (write_changed_settings): write value of spinbox into settings file * settings-dialog.ui: new spinbox for terminals buffer size (terminal tab)

--- a/libgui/qterminal/libqterminal/unix/QUnixTerminalImpl.h
+++ b/libgui/qterminal/libqterminal/unix/QUnixTerminalImpl.h
@@ -47,7 +47,7 @@
     void setForegroundColor (const QColor& color);
     void setSelectionColor (const QColor& color);
     void setCursorColor (bool useForegroundColor, const QColor& color);
-
+    void setScrollBufferSize(int value);
     QString selectedText();
 
 public slots: