Rendering error with i18n:msg attribute

[rblank]

The following snippet renders incorrectly in Trac (anydiff of two paths, changeset view):

<h1 py:when="not changeset and not restricted" i18n:msg="reponame, old_path, old_rev, new_path, new_rev">
  Changes<py:if test="reponame"> in $reponame</py:if>
  from <a title="Show entry in browser" href="${href.browser(reponame, old_path, rev=old_rev)}">$old_path</a>
  at <a title="Show full changeset" href="${href.changeset(old_rev, reponame)}">r$old_rev</a>
  to <a title="Show entry in browser" href="${href.browser(reponame, new_path, rev=new_rev)}">$new_path</a>
  at <a title="Show full changeset" href="${href.changeset(new_rev, reponame)}">r$new_rev</a>
</h1>

The result is:

<h1>Changes
  from <a title="Show entry in browser" href="/browser/branches/0.11-stable/trac/util?rev=8271">branches/0.11-stable/trac/util</a>
  at <a title="Show full changeset" href="/changeset/8271/trac">r8271</a><a title="Show entry in browser" href="/browser/trunk/trac/util?rev=8271">trunk/trac/util</a>
  at <a title="Show full changeset" href="/changeset/8271/trac">r8271</a></h1>

Note how the "to" (in "Changes from ... at ... to ... at ...") as well as some whitespace are missing.

See ​here for the rendering of this example, and note the missing "to" in the heading.

[cboos]

Oh, that must be because of the <py:if test="reponame"> in $reponame</py:if>. Conditionals in i18n:msg are not supported (#372). I'll try to fix that.

But it's true that there are still errors with i18n:msg, when trying to fix ​#T9159 I stumbled upon a similar issue, and that one didn't imply any embedded py: directive. More details on this problem later.

[rblank]

Oh, right, my bad. I tried separating the py:when from the i18n:msg, but I didn't think about the contained py:if.

So I guess we can close this as a duplicate, then?

[cboos]

Ok, I'll another one later with the issue for ​#T9159.

Duplicate of #372.