patch 8.0.0615: using % with :hardcopy wrongly escapes spaces

Problem:    Using % with :hardcopy wrongly escapes spaces. (Alexey Muranov)
Solution:   Expand % differently. (Christian Brabandt, closes #1682)

src/ex_docmd.c

@@ -5042,6 +5042,7 @@ expand_filename(
 		&& eap->cmdidx != CMD_lgrep
 		&& eap->cmdidx != CMD_grepadd
 		&& eap->cmdidx != CMD_lgrepadd
+		&& eap->cmdidx != CMD_hardcopy
 #ifndef UNIX
 		&& !(eap->argt & NOSPC)
 #endif

src/testdir/test_hardcopy.vim

@@ -60,3 +60,12 @@ func Test_with_syntax()
     set printoptions&
   endif
 endfunc
+
+func Test_fname_with_spaces()
+  split t\ e\ s\ t.txt
+  call setline(1, ['just', 'some', 'text'])
+  hardcopy > %.ps
+  call assert_true(filereadable('t e s t.txt.ps'))
+  call delete('t e s t.txt.ps')
+  bwipe!
+endfunc

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    615,
 /**/
     614,
 /**/