patch 8.0.1672: error during completion causes command to be cancelled

Problem:    Error during completion causes command to be cancelled.
Solution:   Reset did_emsg before waiting for another character. (Tom M.)

src/ex_getln.c

@@ -426,6 +426,10 @@ getcmdline(
 #endif
 	quit_more = FALSE;	/* reset after CTRL-D which had a more-prompt */
 
+	did_emsg = FALSE;	/* There can't really be a reason why an error
+				   that occurs while typing a command should
+				   cause the command not to be executed. */
+
 	cursorcmd();		/* set the cursor on the right spot */
 
 	/* Get a character.  Ignore K_IGNORE and K_NOP, they should not do

src/testdir/test_cmdline.vim

@@ -316,6 +316,17 @@ func Test_paste_in_cmdline()
   call feedkeys(":\<C-\>etoupper(getline(1))\<CR>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"ASDF.X /TMP/SOME VERYLONGWORD A;B-C*D ', @:)
   bwipe!
+
+  " Error while typing a command used to cause that it was not executed
+  " in the end.
+  new
+  try
+    call feedkeys(":file \<C-R>%Xtestfile\<CR>", 'tx')
+  catch /^Vim\%((\a\+)\)\=:E32/
+    " ignore error E32
+  endtry
+  call assert_equal("Xtestfile", bufname("%"))
+  bwipe!
 endfunc
 
 func Test_remove_char_in_cmdline()

src/version.c

@@ -762,6 +762,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1672,
 /**/
     1671,
 /**/