[lldb] Use EL_REFRESH to refresh Editline

Letting Editline refresh itself is more robust and ensures that the
current text is redraw if it was accidentally cleared. In that scenario
MoveCursor would only fix up the cursor position.

(cherry picked from commit 3edae0d)

Author: JDevlieghere

lldb/source/Host/common/Editline.cpp

@@ -1713,7 +1713,7 @@ void Editline::Refresh() {
   if (!m_editline || !m_output_stream_sp)
     return;
   LockedStreamFile locked_stream = m_output_stream_sp->Lock();
-  MoveCursor(CursorLocation::EditingCursor, CursorLocation::EditingCursor);
+  el_set(m_editline, EL_REFRESH);
 }
 
 bool Editline::CompleteCharacter(char ch, EditLineGetCharType &out) {

lldb/test/API/functionalities/statusline/TestStatusline.py

@@ -114,8 +114,6 @@ def test_resize(self):
         self.resize()
         self.expect("set set show-statusline true", ["no target"])
         self.resize(20, 60)
-        # Check for the newline followed by the escape code to move the cursor
-        # up one line.
-        self.child.expect(re.escape("\n\x1b[1A"))
-        # Check for the escape code to move the cursor back to column 8.
-        self.child.expect(re.escape("\x1b[8G"))
+        # Check for the escape code to resize the scroll window, followed by
+        # the prompt.
+        self.child.expect(re.escape("\x1b[1;19r\x1b8(lldb)"))