Fix progress bar display when cursor not at left edge

Fix by saving the cursor position, displaying the progress, and restoring the cursor back to the original position so normal formatting (e.g. table output) can continue.

Closes PowerShell#3453.

src/Microsoft.PowerShell.ConsoleHost/host/msh/ProgressPane.cs

@@ -91,11 +91,20 @@ class ProgressPane
 
                 int rows = tempProgressRegion.GetLength(0);
                 int cols = tempProgressRegion.GetLength(1);
+
+                _savedCursor = _rawui.CursorPosition;
                 _location.X = 0;
 
 #if UNIX
                 _location.Y = _rawui.CursorPosition.Y;
 
+                // if cursor is not on left edge already move down one line
+                if (_rawui.CursorPosition.X != 0)
+                {
+                    _location.Y++;
+                    _rawui.CursorPosition = _location;
+                }
+
                 //if the cursor is at the bottom, create screen buffer space by scrolling
                 int scrollRows = rows - ((_rawui.BufferSize.Height - 1) - _location.Y);
                 for (int i = 0; i < rows; i++)
@@ -105,6 +114,7 @@ class ProgressPane
                 if (scrollRows > 0)
                 {
                     _location.Y -= scrollRows;
+                    _savedCursor.Y -= scrollRows;
                 }
 
                 //create cleared region to clear progress bar later
@@ -161,6 +171,7 @@ class ProgressPane
 
                 _rawui.SetBufferContents(_location, _savedRegion);
                 _savedRegion = null;
+                _rawui.CursorPosition = _savedCursor;
             }
         }
 
@@ -249,6 +260,7 @@ class ProgressPane
 
 
         private Coordinates _location = new Coordinates(0, 0);
+        private Coordinates _savedCursor;
         private Size _bufSize;
         private BufferCell[,] _savedRegion;
         private BufferCell[,] _progressRegion;