Fix handling of border-radius with only one value (MDL-61496)

[timhunt]

This was breaking RTL in the OU theme. This fix works there. Because of issue #3, I cannot easily add a unit test (but I would if the tests passed).

Anyway, please could this be merged (along with the other pull request that has been sitting around for months.

Then, please, could this library be updated in Moodle core - these are bug fixes, so should be done on all stable branches.

[timhunt]

By the way Diff easier to read if you ignore space changes.

[timhunt]

For reference, before this fix, the error message was

Exception - Call to undefined method Sabberworm\CSS\Value\Size::getListComponents()

Stack trace:

    line 273 of \lib\rtlcss\RTLCSS.php: Error thrown
    line 223 of \lib\rtlcss\RTLCSS.php: call to MoodleHQ\RTLCSS\RTLCSS->processRule()
    line 55 of \lib\classes\rtlcss.php: call to MoodleHQ\RTLCSS\RTLCSS->processDeclaration()
    line 192 of \lib\rtlcss\RTLCSS.php: call to core_rtlcss->processDeclaration()
    line 63 of \lib\rtlcss\RTLCSS.php: call to MoodleHQ\RTLCSS\RTLCSS->processBlock()
    line 1859 of \lib\outputlib.php: call to MoodleHQ\RTLCSS\RTLCSS->flip()
    line 1837 of \lib\outputlib.php: call to theme_config->rtlize()
    line 1161 of \lib\outputlib.php: call to theme_config->post_process()
    line 205 of \theme\styles.php: call to theme_config->get_css_content()
    line 171 of \theme\styles.php: call to theme_styles_generate_and_store()

[timhunt]

The required unit tests probably look something like timhunt@2673897, if anyone can get the tests working.

[timhunt]

Amended commit pushed. (Also rebased)

[sarjona]

Thanks Tim! Now the patch looks good and it's working as expected so I'm more than happy to merge it! :-)

[timhunt]

Awesome. Thanks :-)