vim-patch:8.0.0724: the message for yanking doesn't indicate the register

Problem:    The message for yanking doesn't indicate the register.
Solution:   Show the register name in the "N lines yanked" message. (Lemonboy,
            closes vim/vim#1803, closes vim/vim#1809)
e45deb7997

src/nvim/ops.c

@@ -2509,19 +2509,27 @@ static void op_yank_reg(oparg_T *oap, bool message, yankreg_T *reg, bool append)
     }
     // Some versions of Vi use ">=" here, some don't...
     if (yanklines > (size_t)p_report) {
+      char namebuf[100];
+
+      if (oap->regname == NUL) {
+        *namebuf = NUL;
+      } else {
+        vim_snprintf(namebuf, sizeof(namebuf), " into \"%c", oap->regname);
+      }
+
       // redisplay now, so message is not deleted
       update_topline_redraw();
       if (yanklines == 1) {
         if (yank_type == kMTBlockWise) {
-          MSG(_("block of 1 line yanked"));
+          smsg(_("block of 1 line yanked%s"), namebuf);
         } else {
-          MSG(_("1 line yanked"));
+          smsg(_("1 line yanked%s"), namebuf);
         }
       } else if (yank_type == kMTBlockWise) {
-        smsg(_("block of %" PRId64 " lines yanked"),
+        smsg(_("block of %" PRId64 " lines yanked%s"),
-             (int64_t)yanklines);
+             (int64_t)yanklines, namebuf);
       } else {
-        smsg(_("%" PRId64 " lines yanked"), (int64_t)yanklines);
+        smsg(_("%" PRId64 " lines yanked%s"), (int64_t)yanklines, namebuf);
       }
     }
   }

src/nvim/testdir/Makefile

@@ -93,6 +93,7 @@ NEW_TESTS ?= \
 	    test_quickfix.res \
 	    test_quotestar.res \
 	    test_recover.res \
+	    test_registers.res \
 	    test_retab.res \
 	    test_scrollbind.res \
 	    test_search.res \

src/nvim/testdir/test_registers.vim

@@ -0,0 +1,27 @@
+
+func Test_yank_shows_register()
+    enew
+    set report=0
+    call setline(1, ['foo', 'bar'])
+    " Line-wise
+    exe 'norm! yy'
+    call assert_equal('1 line yanked', v:statusmsg)
+    exe 'norm! "zyy'
+    call assert_equal('1 line yanked into "z', v:statusmsg)
+    exe 'norm! yj'
+    call assert_equal('2 lines yanked', v:statusmsg)
+    exe 'norm! "zyj'
+    call assert_equal('2 lines yanked into "z', v:statusmsg)
+
+    " Block-wise
+    exe "norm! \<C-V>y"
+    call assert_equal('block of 1 line yanked', v:statusmsg)
+    exe "norm! \<C-V>\"zy"
+    call assert_equal('block of 1 line yanked into "z', v:statusmsg)
+    exe "norm! \<C-V>jy"
+    call assert_equal('block of 2 lines yanked', v:statusmsg)
+    exe "norm! \<C-V>j\"zy"
+    call assert_equal('block of 2 lines yanked into "z', v:statusmsg)
+
+    bwipe!
+endfunc