Optimise multi_progress_bar tty control sequences

Instead of sending multiple cursor_up and clear_line sequences,
send a single command to move the cursor up multiple lines.

This makes the tty::clear_line redundant, because the next update
will overwrite the previous lines anyway.

include/libdnf5-cli/tty.hpp

@@ -47,6 +47,15 @@ LIBDNF_CLI_API std::ostream & white(std::ostream & stream);
 LIBDNF_CLI_API std::ostream & clear_line(std::ostream & stream);
 LIBDNF_CLI_API std::ostream & cursor_up(std::ostream & stream);
 
+class cursor_up_multiple_lines {
+public:
+    explicit cursor_up_multiple_lines(std::size_t);
+    LIBDNF_CLI_API friend std::ostream & operator<<(std::ostream & os, const cursor_up_multiple_lines & cursorUp);
+
+private:
+    std::size_t line_count;
+};
+
 LIBDNF_CLI_API std::ostream & cursor_hide(std::ostream & stream);
 LIBDNF_CLI_API std::ostream & cursor_show(std::ostream & stream);
 

libdnf5-cli/progressbar/multi_progress_bar.cpp

@@ -105,10 +105,10 @@ std::ostream & operator<<(std::ostream & stream, MultiProgressBar & mbar) {
     text_buffer.clear();
 
     if (is_interactive && mbar.num_of_lines_to_clear > 0) {
-        text_buffer << tty::clear_line;
-        for (std::size_t i = 1; i < mbar.num_of_lines_to_clear; i++) {
-            text_buffer << tty::cursor_up << tty::clear_line;
+        if (mbar.num_of_lines_to_clear > 1) {
+            text_buffer << tty::cursor_up_multiple_lines(mbar.num_of_lines_to_clear - 1);
         }
+
         text_buffer << "\r";
     } else if (mbar.line_printed) {
         text_buffer << std::endl;

libdnf5-cli/tty.cpp

@@ -65,6 +65,16 @@ bool is_interactive() {
     }
 
 
+// tty::cursor_up_multiple_lines(std::size_t line_count)
+cursor_up_multiple_lines::cursor_up_multiple_lines(std::size_t line_count) : line_count(line_count) {}
+
+LIBDNF_CLI_API std::ostream & operator<<(std::ostream & os, const cursor_up_multiple_lines & cursor) {
+    if (is_interactive()) {
+        os << "\033[" << cursor.line_count << "A";
+    }
+    return os;
+}
+
 // tty::reset
 TTY_COMMAND(reset, "\033[0m")