patch 8.1.2164: stuck when using "j" in a popupwin with popup_filter_menu

Problem:    Stuck when using "j" in a popupwin with popup_filter_menu if a
            line wraps.
Solution:   Check the cursor line is visible. (closes #4577)

Author: brammool

src/popupwin.c

@@ -535,7 +535,7 @@ check_highlight(dict_T *dict, char *name, char_u **pval)
 }
 
 /*
- * Scroll to show the line with the cursor.  This assumes lines don't wrap.
+ * Scroll to show the line with the cursor.
  */
     static void
 popup_show_curline(win_T *wp)
@@ -550,6 +550,11 @@ popup_show_curline(win_T *wp)
 	    wp->w_topline = 1;
 	else if (wp->w_topline > wp->w_buffer->b_ml.ml_line_count)
 	    wp->w_topline = wp->w_buffer->b_ml.ml_line_count;
+	while (wp->w_topline < wp->w_cursor.lnum
+		&& wp->w_topline < wp->w_buffer->b_ml.ml_line_count
+		&& plines_m_win(wp, wp->w_topline, wp->w_cursor.lnum)
+								> wp->w_height)
+	    ++wp->w_topline;
     }
 
     // Don't use "firstline" now.
@@ -1041,6 +1046,7 @@ popup_adjust_position(win_T *wp)
     linenr_T	lnum;
     int		wrapped = 0;
     int		maxwidth;
+    int		used_maxwidth = FALSE;
     int		maxspace;
     int		center_vert = FALSE;
     int		center_hor = FALSE;
@@ -1208,6 +1214,7 @@ popup_adjust_position(win_T *wp)
 		++wrapped;
 		len -= maxwidth;
 		wp->w_width = maxwidth;
+		used_maxwidth = TRUE;
 	    }
 	}
 	else if (len > maxwidth
@@ -1259,6 +1266,8 @@ popup_adjust_position(win_T *wp)
     {
 	++right_extra;
 	++extra_width;
+	if (used_maxwidth)
+	    maxwidth -= 2;  // try to show the scrollbar
     }
 
     minwidth = wp->w_minwidth;

src/testdir/dumps/Test_popupwin_wrap_1.dump

@@ -0,0 +1,10 @@
+>1+0&#ffffff0| @73
+|2| @73
+|╔+0#0000001#ffd7ff255|═@73
+|║| |o+0&#e0e0e08|n|e| @67| +0&#ffd7ff255| +0#0000000#0000001
+|║+0#0000001#ffd7ff255| |a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d| | +0#0000000#0000001
+|║+0#0000001#ffd7ff255| |f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s| @52| +0#0000000#a8a8a8255
+|╚+0#0000001#ffd7ff255|═@73
+|8+0#0000000#ffffff0| @73
+|9| @73
+@57|1|,|1| @10|T|o|p| 

src/testdir/dumps/Test_popupwin_wrap_2.dump

@@ -0,0 +1,10 @@
+>1+0&#ffffff0| @73
+|2| @73
+|╔+0#0000001#ffd7ff255|═@73
+|║| |a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d| | +0#0000000#a8a8a8255
+|║+0#0000001#ffd7ff255| |f|a|s|d|f|a|s|d|f|a|s|d|f|a|s|d|f|a|s| @52| +0#0000000#0000001
+|║+0#0000001#ffd7ff255| |t+0&#e0e0e08|h|r|e@1| @65| +0&#ffd7ff255| +0#0000000#0000001
+|╚+0#0000001#ffd7ff255|═@73
+|8+0#0000000#ffffff0| @73
+|9| @73
+@57|1|,|1| @10|T|o|p| 

src/testdir/test_popupwin.vim

@@ -509,6 +509,38 @@ func Test_popup_close_with_mouse()
   call delete('XtestPopupClose')
 endfunction
 
+func Test_popup_menu_wrap()
+  CheckScreendump
+
+  let lines =<< trim END
+	call setline(1, range(1, 20))
+	call popup_create([
+	      \ 'one',
+	      \ 'asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfas',
+	      \ 'three',
+	      \ 'four',
+	      \ ], #{
+	      \ pos: "botleft",
+	      \ border: [],
+	      \ padding: [0,1,0,1],
+	      \ maxheight: 3,
+	      \ cursorline: 1,
+	      \ filter: 'popup_filter_menu',
+	      \ })
+  END
+  call writefile(lines, 'XtestPopupWrap')
+  let buf = RunVimInTerminal('-S XtestPopupWrap', #{rows: 10})
+  call VerifyScreenDump(buf, 'Test_popupwin_wrap_1', {})
+
+  call term_sendkeys(buf, "jj")
+  call VerifyScreenDump(buf, 'Test_popupwin_wrap_2', {})
+
+  " clean up
+  call term_sendkeys(buf, "\<Esc>")
+  call StopVimInTerminal(buf)
+  call delete('XtestPopupWrap')
+endfunction
+
 func Test_popup_with_mask()
   CheckScreendump
 

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2164,
 /**/
     2163,
 /**/