patch 8.0.0543: test_edit causes older xfce4-terminal to close

Problem:    Test_edit causes older xfce4-terminal to close. (Dominique Pelle)
Solution:   Reduce number of columns to 2000.  Try to restore the window
            position.
diff --git a/src/proto/term.pro b/src/proto/term.pro
index 0c238d3..7d9fc6a 100644
--- a/src/proto/term.pro
+++ b/src/proto/term.pro
@@ -22,6 +22,7 @@
 void term_append_lines(int line_count);
 void term_delete_lines(int line_count);
 void term_set_winpos(int x, int y);
+int term_get_winpos(int *x, int *y);
 void term_set_winsize(int width, int height);
 void term_fg_color(int n);
 void term_bg_color(int n);