'SVN Add as external here' does not work for directories with whitespaces

Hello,

Getting this error when adding an external item via right-dragging and
selecting 'SVN Add as external here':
[[[
Error parsing svn:externals property on
 'C:\Users\MyUser.CORP\Desktop\MyRepo\MyProject\testtree':
 '^/MyProject/foo%20bar foo bar'
]]]

The problem occurs for directories with a whitespace in name, e.g. `foo
bar`.

I can add such `svn:externals` via TortoiseSVN's property editor or using
svn.exe without any errors. Here is the output of `svn status -v` after
adding the property via svn.exe. But adding `foo bar` as an external item
to `testtree` via 'SVN Add as external here' fails.
[[[
                 8 8 user .
                 8 7 user foo bar
                 9 9 user testtree
X testtree\foo bar

Performing status on external item at 'testtree\foo bar':
                 9 7 user testtree\foo bar
]]]

I'm using TortoiseSVN 1.9.4 64-bit.

--
With best regards,
Pavel Lyalyakin
VisualSVN Team
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