[Merge] lp:~evfool/software-properties/lp599803 into lp:software-properties

[Robert Roth]

Added support for case-insensitive typeahead searching activated with Ctrl+F (by default) in the Other Software tab (custom sources).
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https://code.launchpad.net/~evfool/software-properties/lp599803/+merge/108869
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~evfool/software-properties/lp599803 into lp:software-properties.