[MDL-42112] Error in tablelib.php with only one column - Moodle Tracker

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Testing Instructions:

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run ./vendor/bin/phpunit lib/tests/tablelib_test.php in all branches.

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run ./vendor/bin/phpunit lib/tests/tablelib_test.php in all branches.
Affected Branches:
MOODLE_24_STABLE, MOODLE_25_STABLE
Fixed Branches:
MOODLE_24_STABLE, MOODLE_25_STABLE
Pull from Repository:
git://github.com/damyon/moodle.git
Pull Master Branch:
~~MDL-42112~~-master
Pull Master Diff URL:
https://github.com/damyon/moodle/compare/bca2951282db9e7cb38e98cf2b978ed6283c2e6e...MDL-42112-master

I get the following error with a table with only one column:

Warning: array_fill() [<a href='function.array-fill'>function.array-fill</a>]: Number of elements must be positive in lib/tablelib.php on line 1043

It seems to be caused by the "-1" after the count. There is no error without the "-1" or with two columns.

The change was introduced in ~~MDL-36011~~.

is a regression caused by

MDL-36011 flexible table hide column does not announce change to screen reader