patch 8.1.1665: crash when popup window with mask is below the screen

Problem:    Crash when popup window with mask is below the screen.
Solution:   Correct boundary check.

Author: brammool

src/popupwin.c

@@ -2323,8 +2323,10 @@ update_popup_transparent(win_T *wp, int val)
 	    --lines;
 	    if (lines < 0)
 		lines = 0;
-	    for (line = lines; line < linee && line < screen_Rows; ++line)
-		for (col = cols; col < cole && col < screen_Columns; ++col)
+	    for (line = lines; line < linee
+				  && line + wp->w_winrow < screen_Rows; ++line)
+		for (col = cols; col < cole
+				&& col + wp->w_wincol < screen_Columns; ++col)
 		    popup_transparent[(line + wp->w_winrow) * screen_Columns
 						   + col + wp->w_wincol] = val;
 	}

src/testdir/dumps/Test_popupwin_mask_5.dump

@@ -0,0 +1,13 @@
+>1+0&#ffffff0|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|x+0#0000001#ffd7ff255@8|8+0#0000000#ffffff0|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|y+0#0000001#ffd7ff255@8|8+0#0000000#ffffff0|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|1|2|3|4|5|6|7|8|9|1|0|1@2|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|2|7|2|8|2|9|3|0|3|1|3|2|3@2|4|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+| +0&#e0e0e08@11|1+0&#ffffff0@1|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|2|6|═+0#0000001#ffd7ff255@13|X|4+0#0000000#ffffff0|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|o+0&#e0e0e08|m|e| |5+0&#ffffff0|6|7|t+0&#e0e0e08| @3|1+0&#ffffff0@1|2|1|3|1|4|1|5|1|6|1|7|1|8|1|9|2|0|2|1|2@2|3|2|4|2|5|║+0#0000001#ffd7ff255| @4|2+0#0000000#ffffff0|9|3| +0#0000001#ffd7ff255@6|║|4+0#0000000#ffffff0|3|5|3|6|3|7|3|8|3|9|4|0|4|1|4|2
+|:|c|t+0&#e0e0e08|h|l+0&#ffffff0| |p|l+0&#e0e0e08|i|n|e| |m+0&#ffffff0|o|v|e|(|w|i|n|i|d|b|,| |{|'|p|o|s|'|:| |'|t|o|p|l|e|f|t|║+0#0000001#ffd7ff255| |j|u|s|t|l+0#0000000#ffffff0|'|:|e+0#0000001#ffd7ff255| |l|i|n|e| |║|,+0#0000000#ffffff0|1| @10|T|o|p| 

src/testdir/test_popupwin.vim

@@ -486,6 +486,10 @@ func Test_popup_with_mask()
   call term_sendkeys(buf, ":call popup_move(winidb, {'pos': 'topright', 'col': 12})\<CR>")
   call VerifyScreenDump(buf, 'Test_popupwin_mask_4', {})
 
+  call term_sendkeys(buf, ":call popup_move(winid, {'pos': 'topright', 'col': 12, 'line': 11})\<CR>")
+  call term_sendkeys(buf, ":call popup_move(winidb, {'pos': 'topleft', 'col': 42, 'line': 11})\<CR>")
+  call VerifyScreenDump(buf, 'Test_popupwin_mask_5', {})
+
   " clean up
   call StopVimInTerminal(buf)
   call delete('XtestPopupMask')

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1665,
 /**/
     1664,
 /**/