tests/qapi-schema: Fix test 'QAPI rST doc'

The test compares Sphinx plain-text output against a golden reference.
To work on Windows hosts, it filters out carriage returns in both
files.  Unfortunately, the filter doesn't work: it creates an empty
file.  Comparing empty files always succeeds.

Fix the filter, and update the golden reference to current Sphinx
output.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240216145841.2099240-2-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

tests/qapi-schema/doc-good.txt

@@ -44,7 +44,7 @@ Values
 ~~~~~~
 
 "one" (**If: **"IFONE")
-   The _one_ {and only}
+   The _one_ {and only}, description on the same line
 
 "two"
    Not documented
@@ -76,7 +76,7 @@ Members
 ~~~~~~~
 
 "base1": "Enum"
-   the first member
+   description starts on a new line, minimally indented
 
 
 If
@@ -90,7 +90,9 @@ If
 
 A paragraph
 
-Another paragraph (but no "var": line)
+Another paragraph
+
+"var1" is undocumented
 
 
 Members
@@ -141,7 +143,8 @@ Members
 ~~~~~~~
 
 "i": "int"
-   an integer "b" is undocumented
+   description starts on the same line remainder indented the same "b"
+   is undocumented
 
 "b": "boolean"
    Not documented
@@ -172,10 +175,10 @@ Arguments
 ~~~~~~~~~
 
 "arg1": "int"
-   the first argument
+   description starts on a new line, indented
 
 "arg2": "string" (optional)
-   the second argument
+   description starts on the same line remainder indented differently
 
 "arg3": "boolean"
    Not documented
@@ -203,12 +206,6 @@ Returns
 "Object"
 
 
-TODO
-~~~~
-
-frobnicate
-
-
 Notes
 ~~~~~
 

tests/qapi-schema/meson.build

@@ -273,15 +273,17 @@ if build_docs
                                     output: ['doc-good.txt.nocr'],
                                     input: qapi_doc_out[0],
                                     build_by_default: true,
-                                    command: [remove_cr, '@INPUT@'],
-                                    capture: true)
+                                    command: [remove_cr],
+                                    capture: true,
+                                    feed: true)
 
   qapi_doc_ref_nocr = custom_target('QAPI rST doc reference newline-sanitized',
                                     output: ['doc-good.ref.nocr'],
                                     input: files('doc-good.txt'),
                                     build_by_default: true,
-                                    command: [remove_cr, '@INPUT@'],
-                                    capture: true)
+                                    command: [remove_cr],
+                                    capture: true,
+                                    feed: true)
 
   test('QAPI rST doc', diff, args: ['-u', qapi_doc_ref_nocr[0], qapi_doc_out_nocr[0]],
        suite: ['qapi-schema', 'qapi-doc'])