(IT_cmgoto): When tracking echo area messages with the

cursor, save and restore previous cursor position in the
minibuffer.

1 files changed, 28 insertions, 5 deletions

diff --git a/src/msdos.c b/src/msdos.c
index 42374ad3657..fc9d3e29925 100644
--- a/src/msdos.c
+++ b/src/msdos.c
@@ -771,15 +771,38 @@ IT_cmgoto (FRAME_PTR f)
   /* Only set the cursor to where it should be if the display is
      already in sync with the window contents.  */
   int update_cursor_pos = MODIFF == unchanged_modified;
-
-  /* If we are in the echo area, and the cursor is beyond the end of
-     the text, put the cursor at the end of text.  */
+  static int previous_pos_X = -1;
+
+  /* If the display is in sync, forget any previous knowledge about
+     cursor position.  This is primarily for unexpected events like
+     C-g in the minibuffer.  */
+  if (update_cursor_pos && previous_pos_X >= 0)
+    previous_pos_X = -1;
+  /* If we are in the echo area, put the cursor at the
+     end of the echo area message.  */
   if (!update_cursor_pos
       && XFASTINT (XWINDOW (FRAME_MINIBUF_WINDOW (f))->top) <= new_pos_Y)
     {
-      int tem_X = FRAME_DESIRED_GLYPHS (f)->used[new_pos_Y];
+      int tem_X = current_pos_X, dummy;
+
+      if (echo_area_glyphs)
+        {
+          tem_X = echo_area_glyphs_length;
+          /* Save current cursor position, to be restored after the
+             echo area message is erased.  Only remember one level
+             of previous cursor position.  */
+          if (previous_pos_X == -1)
+            ScreenGetCursor (&dummy, &previous_pos_X);
+        }
+      else if (previous_pos_X >= 0)
+        {
+          /* We wind up here after the echo area message is erased.
+             Restore the cursor position we remembered above.  */
+          tem_X = previous_pos_X;
+          previous_pos_X = -1;
+        }
 
-      if (current_pos_X > tem_X)
+      if (current_pos_X != tem_X)
         {
           new_pos_X = tem_X;
           update_cursor_pos = 1;