patch 9.0.0595: extra newline in messages after a verbose shell message

Problem:    Extra newline in messages after a verbose shell message.
Solution:   Output the newline with msg_putchar_attr(). (closes #11233)
            Make it possible to filter a screendump before comparing it.

Filelist

@@ -209,6 +209,7 @@ SRC_ALL =	\
 		src/testdir/python_before/*.py \
 		src/testdir/pyxfile/*.py \
 		src/testdir/dumps/*.dump \
+		src/testdir/dumps/*.vim \
 		src/testdir/samples/*.txt \
 		src/testdir/samples/test000 \
 		src/testdir/color_ramp.vim \
@@ -555,7 +556,6 @@ SRC_DOS =	\
 		src/if_ole.cpp \
 		src/if_ole.h \
 		src/if_ole.idl \
-		src/if_perl_msvc/stdbool.h \
 		src/iscygpty.c \
 		src/iscygpty.h \
 		src/iid_ole.c \
@@ -624,10 +624,8 @@ SRC_DOS_BIN =	\
 		src/xpm/include/*.h \
 		src/xpm/x64/lib-vc14/libXpm.lib \
 		src/xpm/x64/lib/libXpm.a \
-		src/xpm/x64/lib/libXpm.lib \
 		src/xpm/x86/lib-vc14/libXpm.lib \
 		src/xpm/x86/lib/libXpm.a \
-		src/xpm/x86/lib/libXpm.lib \
 		runtime/bitmaps/vim.ico \
 		nsis/icons.zip \
 

src/message.c

@@ -2602,7 +2602,8 @@ msg_puts_display(
     if (msg_win != NULL)
 	popup_show_message_win();
 #endif
-    if (p_more && !recurse)
+    // Store the text for scroll back, unless it's a newline by itself.
+    if (p_more && !recurse && !(s == sb_str + 1 && *sb_str == '\n'))
 	store_sb_text(&sb_str, s, attr, &sb_col, FALSE);
 
     msg_check();

src/misc2.c

@@ -1795,7 +1795,7 @@ call_shell(char_u *cmd, int opt)
     {
 	verbose_enter();
 	smsg(_("Calling shell to execute: \"%s\""), cmd == NULL ? p_sh : cmd);
-	out_char('\n');
+	msg_putchar_attr('\n', 0);
 	cursor_on();
 	verbose_leave();
     }

src/testdir/dumps/Test_verbose_system_1.dump

@@ -0,0 +1,10 @@
+|C+0&#ffffff0|a|l@1|i|n|g| |s|h|e|l@1| |t|o| |e|x|e|c|u|t|e|:| |"|(|s|e|q| |2|0|)|>|/|t|m|p|/|v|W|4|d|k|0|a|/|0| |2|>|&|1|"| @18
+|1| @73
+|2| @73
+|3| @73
+|4| @73
+|5| @73
+|6| @73
+|7| @73
+|8| @73
+|-+0#00e0003&@1| |M|o|r|e| |-@1> +0#0000000&@64

src/testdir/dumps/Test_verbose_system_1.vim

@@ -0,0 +1,3 @@
+" Filter that removes the ever changing temp directory name from the screendump
+" that shows the system() command executed.
+1s+|t|m|p|/|.|.|.*| |+|t|m|p|/|x|x|x|x|x|x|x|/|1| |+

src/testdir/dumps/Test_verbose_system_2.dump

@@ -0,0 +1,10 @@
+|C+0&#ffffff0|a|l@1|i|n|g| |s|h|e|l@1| |t|o| |e|x|e|c|u|t|e|:| |"|(|s|e|q| |2|0|)|>|/|t|m|p|/|v|V|v|w|c|g|V|/|1| |2|>|&|1|"| @18
+|1| @73
+|2| @73
+|3| @73
+|4| @73
+|5| @73
+|6| @73
+|7| @73
+|8| @73
+|-+0#00e0003&@1| |M|o|r|e| |-@1> +0#0000000&@64

src/testdir/dumps/Test_verbose_system_2.vim

@@ -0,0 +1,3 @@
+" Filter that removes the ever changing temp directory name from the screendump
+" that shows the system() command executed.
+1s+|t|m|p|/|.|.|.*| |+|t|m|p|/|x|x|x|x|x|x|x|/|1| |+

src/testdir/screendump.vim

@@ -13,16 +13,43 @@ if !has('terminal')
   finish
 endif
 
+" Read a dump file "fname" and if "filter" exists apply it to the text.
+def ReadAndFilter(fname: string, filter: string): list<string>
+  var contents = readfile(fname)
+
+  if filereadable(filter)
+    # do this in the bottom window so that the terminal window is unaffected
+    wincmd j
+    enew
+    setline(1, contents)
+    exe "source " .. filter
+    contents = getline(1, '$')
+    enew!
+    wincmd k
+    redraw
+  endif
+
+  return contents
+enddef
+
+
 " Verify that Vim running in terminal buffer "buf" matches the screen dump.
 " "options" is passed to term_dumpwrite().
 " Additionally, the "wait" entry can specify the maximum time to wait for the
 " screen dump to match in msec (default 1000 msec).
 " The file name used is "dumps/{filename}.dump".
+"
+" To ignore part of the dump, provide a "dumps/{filename}.vim" file with
+" Vim commands to be applied to both the reference and the current dump, so
+" that parts that are irrelevant are not used for the comparison.  The result
+" is NOT written, thus "term_dumpdiff()" shows the difference anyway.
+"
 " Optionally an extra argument can be passed which is prepended to the error
 " message.  Use this when using the same dump file with different options.
 " Returns non-zero when verification fails.
 func VerifyScreenDump(buf, filename, options, ...)
   let reference = 'dumps/' . a:filename . '.dump'
+  let filter = 'dumps/' . a:filename . '.vim'
   let testfile = 'failed/' . a:filename . '.dump'
 
   let max_loops = get(a:options, 'wait', 1000) / 10
@@ -37,6 +64,13 @@ func VerifyScreenDump(buf, filename, options, ...)
   " text and attributes only from the internal buffer.
   redraw
 
+  if filereadable(reference)
+    let refdump = ReadAndFilter(reference, filter)
+  else
+    " Must be a new screendump, always fail
+    let refdump = []
+  endif
+
   let did_mkdir = 0
   if !isdirectory('failed')
     let did_mkdir = 1
@@ -49,13 +83,7 @@ func VerifyScreenDump(buf, filename, options, ...)
     sleep 10m
     call delete(testfile)
     call term_dumpwrite(a:buf, testfile, a:options)
-    let testdump = readfile(testfile)
-    if filereadable(reference)
-      let refdump = readfile(reference)
-    else
-      " Must be a new screendump, always fail
-      let refdump = []
-    endif
+    let testdump = ReadAndFilter(testfile, filter)
     if refdump == testdump
       call delete(testfile)
       if did_mkdir

src/testdir/test_messages.vim

@@ -336,6 +336,40 @@ func Test_message_more_scrollback()
   call StopVimInTerminal(buf)
 endfunc
 
+" Test verbose message before echo command
+func Test_echo_verbose_system()
+  CheckRunVimInTerminal
+  CheckUnix
+
+  let buf = RunVimInTerminal('', {'rows': 10})
+  call term_sendkeys(buf, ":4 verbose echo system('seq 20')\<CR>")
+  " Note that the screendump is filtered to remove the name of the temp file
+  call VerifyScreenDump(buf, 'Test_verbose_system_1', {})
+
+  " display a page and go back, results in exactly the same view
+  call term_sendkeys(buf, ' ')
+  call TermWait(buf)
+  call term_sendkeys(buf, 'b')
+  call VerifyScreenDump(buf, 'Test_verbose_system_1', {})
+
+  " do the same with 'cmdheight' set to 2
+  call term_sendkeys(buf, 'q')
+  call TermWait(buf)
+  call term_sendkeys(buf, ":set ch=2\<CR>")
+  call TermWait(buf)
+  call term_sendkeys(buf, ":4 verbose echo system('seq 20')\<CR>")
+  call VerifyScreenDump(buf, 'Test_verbose_system_2', {})
+
+  call term_sendkeys(buf, ' ')
+  call TermWait(buf)
+  call term_sendkeys(buf, 'b')
+  call VerifyScreenDump(buf, 'Test_verbose_system_2', {})
+
+  call term_sendkeys(buf, 'q')
+  call TermWait(buf)
+  call StopVimInTerminal(buf)
+endfunc
+
 
 func Test_ask_yesno()
   CheckRunVimInTerminal

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    595,
 /**/
     594,
 /**/