patch 8.1.2110: CTRL-C closes two popups instead of one

Problem:    CTRL-C closes two popups instead of one.
Solution:   Reset got_int when the filter consumed the key.

src/getchar.c

@@ -1791,7 +1791,11 @@ vgetc(void)
 #endif
 #ifdef FEAT_TEXT_PROP
     if (popup_do_filter(c))
+    {
+	if (c == Ctrl_C)
+	    got_int = FALSE;  // avoid looping
 	c = K_IGNORE;
+    }
 #endif
 
     // Need to process the character before we know it's safe to do something

src/testdir/test_popupwin.vim

@@ -2568,4 +2568,26 @@ func Test_popupwin_getoptions_tablocal()
   quit
 endfunc
 
+func Test_popupwin_cancel()
+  let win1 = popup_create('one', #{line: 5, filter: {... -> 0}})
+  let win2 = popup_create('two', #{line: 10, filter: {... -> 0}})
+  let win3 = popup_create('three', #{line: 15, filter: {... -> 0}})
+  call assert_equal(5, popup_getpos(win1).line)
+  call assert_equal(10, popup_getpos(win2).line)
+  call assert_equal(15, popup_getpos(win3).line)
+  " TODO: this also works without patch 8.1.2110
+  call feedkeys("\<C-C>", 'xt')
+  call assert_equal(5, popup_getpos(win1).line)
+  call assert_equal(10, popup_getpos(win2).line)
+  call assert_equal({}, popup_getpos(win3))
+  call feedkeys("\<C-C>", 'xt')
+  call assert_equal(5, popup_getpos(win1).line)
+  call assert_equal({}, popup_getpos(win2))
+  call assert_equal({}, popup_getpos(win3))
+  call feedkeys("\<C-C>", 'xt')
+  call assert_equal({}, popup_getpos(win1))
+  call assert_equal({}, popup_getpos(win2))
+  call assert_equal({}, popup_getpos(win3))
+endfunc
+
 " vim: shiftwidth=2 sts=2

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2110,
 /**/
     2109,
 /**/