patch 8.1.2371: FEAT_TEXT_PROP is a confusing name

Problem:    FEAT_TEXT_PROP is a confusing name.
Solution:   Use FEAT_PROP_POPUP. (Naruhiko Nishino, closes #5291)
diff --git a/src/testdir/runtest.vim b/src/testdir/runtest.vim
index 9372d53..f0cc1ab 100644
--- a/src/testdir/runtest.vim
+++ b/src/testdir/runtest.vim
@@ -177,7 +177,7 @@
   au SwapExists * call HandleSwapExists()
 
   " Close any stray popup windows
-  if has('textprop')
+  if has('popupwin')
     call popup_clear()
   endif
 
diff --git a/src/testdir/test_execute_func.vim b/src/testdir/test_execute_func.vim
index 2f02409..c2d504f 100644
--- a/src/testdir/test_execute_func.vim
+++ b/src/testdir/test_execute_func.vim
@@ -90,7 +90,7 @@
   let line = win_execute(otherwin, 'echo getline(1)')
   call assert_match('the new window', line)
 
-  if has('textprop')
+  if has('popupwin')
     let popupwin = popup_create('the popup win', {'line': 2, 'col': 3})
     redraw
     let line = 'echo getline(1)'->win_execute(popupwin)
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 653ee49..9ecd245 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -1,7 +1,7 @@
 " Tests for popup windows
 
 source check.vim
-CheckFeature textprop
+CheckFeature popupwin
 
 source screendump.vim
 
diff --git a/src/testdir/test_popupwin_textprop.vim b/src/testdir/test_popupwin_textprop.vim
index b112755..1b339d4 100644
--- a/src/testdir/test_popupwin_textprop.vim
+++ b/src/testdir/test_popupwin_textprop.vim
@@ -1,6 +1,7 @@
 " Tests for popup windows for text properties
 
 source check.vim
+CheckFeature popupwin
 CheckFeature textprop
 
 source screendump.vim