patch 8.2.1193: terminal window not redrawn when dragging a popup window

Problem:    Terminal window not redrawn when dragging a popup window over it.
Solution:   Redraw terminal window. (fixes #6438)

src/popupwin.c

@@ -3503,10 +3503,16 @@ may_update_popup_mask(int type)
 			// once for each window line.
 			wp = mouse_find_win(&line_cp, &col_cp, IGNORE_POPUP);
 			if (wp != NULL)
+			{
+			    // A terminal window needs to be redrawn.
+			    if (bt_terminal(wp->w_buffer))
+				redraw_win_later(wp, NOT_VALID);
+			    else
 			    {
 				if (wp != prev_wp)
 				{
-				vim_memset(plines_cache, 0, sizeof(int) * Rows);
+				    vim_memset(plines_cache, 0,
+							   sizeof(int) * Rows);
 				    prev_wp = wp;
 				}
 
@@ -3515,12 +3521,13 @@ may_update_popup_mask(int type)
 				    wp->w_redr_status = TRUE;
 				else
 				{
-				// compute the position in the buffer line from
-				// the position in the window
+				    // compute the position in the buffer line
+				    // from the position in the window
 				    mouse_comp_pos(wp, &line_cp, &col_cp,
 							  &lnum, plines_cache);
 				    redrawWinline(wp, lnum);
 				}
+			    }
 
 			    // This line is going to be redrawn, no need to
 			    // check until the right side of the window.

src/testdir/dumps/Test_popupwin_term_01.dump

@@ -0,0 +1,10 @@
+|$+0&#ffffff0| @73
+@75
+@34|╔+0#0000001#ffd7ff255|═@3|╗| +0#0000000#ffffff0@34
+@34|║+0#0000001#ffd7ff255|1@3|║| +0#0000000#ffffff0@34
+|!+0#ffffff16#00e0003|/|b|i|n|/|s|h| |[|r|u|n@1|i|n|g|]| @15|║+0#0000001#ffd7ff255|2@3|║| +0#ffffff16#00e0003@34
+> +0#0000000#ffffff0@33|╚+0#0000001#ffd7ff255|═@3|⇲| +0#0000000#ffffff0@34
+|~+0#4040ff13&| @73
+|~| @73
+|[+3#0000000&|N|o| |N|a|m|e|]| @65
+| +0&&@74

src/testdir/dumps/Test_popupwin_term_02.dump

@@ -0,0 +1,10 @@
+|$+0&#ffffff0| @73
+@75
+@14|╔+0#0000001#ffd7ff255|═@3|╗| +0#0000000#ffffff0@54
+@14|║+0#0000001#ffd7ff255|1@3|║| +0#0000000#ffffff0@54
+|!+0#ffffff16#00e0003|/|b|i|n|/|s|h| |[|r|u|n@1|║+0#0000001#ffd7ff255|2@3|║| +0#ffffff16#00e0003@54
+> +0#0000000#ffffff0@13|╚+0#0000001#ffd7ff255|═@3|⇲| +0#0000000#ffffff0@54
+|~+0#4040ff13&| @73
+|~| @73
+|[+3#0000000&|N|o| |N|a|m|e|]| @65
+|:+0&&|c|a|l@1| |D|r|a|g|i|t|(|)| @60

src/testdir/test_popupwin.vim

@@ -577,6 +577,40 @@ func Test_popup_drag()
   call delete('XtestPopupDrag')
 endfunc
 
+func Test_popup_drag_termwin()
+  CheckUnix
+  CheckScreendump
+  CheckFeature terminal
+
+  " create a popup that covers the terminal window
+  let lines =<< trim END
+	set shell=/bin/sh noruler
+        terminal
+	$wincmd w
+	let winid = popup_create(['1111', '2222'], #{
+	      \ drag: 1,
+	      \ resize: 1,
+	      \ border: [],
+	      \ line: 3,
+	      \ })
+	func Dragit()
+	  call feedkeys("\<F3>\<LeftMouse>\<F4>\<LeftDrag>\<LeftRelease>", "xt")
+	endfunc
+	map <silent> <F3> :call test_setmouse(3, &columns / 2)<CR>
+	map <silent> <F4> :call test_setmouse(3, &columns / 2 - 20)<CR>
+  END
+  call writefile(lines, 'XtestPopupTerm')
+  let buf = RunVimInTerminal('-S XtestPopupTerm', #{rows: 10})
+  call VerifyScreenDump(buf, 'Test_popupwin_term_01', {})
+
+  call term_sendkeys(buf, ":call Dragit()\<CR>")
+  call VerifyScreenDump(buf, 'Test_popupwin_term_02', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('XtestPopupTerm')
+endfunc
+
 func Test_popup_close_with_mouse()
   CheckScreendump
 

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1193,
 /**/
     1192,
 /**/