Add search aliases for warning templates

[IlyasLebleu]

Adds an option for searching warning templates through aliases, for users unsure about the exact name of the template. For example, typing "llm" in the search field returns the {{uw-ai}} template series.

Currently only used for {{uw-ai}}, although written such that other aliases can easily be added if needed.

[siddharthvp]

I like the idea. It's worth checking though if the feature could be implemented more concisely by building upon the existing Morebits/select2 matchers instead of doing it from scratch.

[IlyasLebleu]

@siddharthvp Good idea! Currently, the matcher used by Twinkle is a custom function that runs on top of the existing Select2 default matcher, as it needs to return all existing children of a matched object. My code modifies the default matcher in order to do both at once (plus the alias functionality) – I'm not sure if that is doable with Select2 alone, but it would be great if possible, especially if you already have any matchers in mind.

I'll take a look at the lint errors today!

[NovemLinguae]

You just need to fix the errors. You can ignore the warnings. Although the "use let or const instead of var" warning might be worth fixing too.

  1438:24  error    'itemProperties' is not defined                                                    no-undef
  1438:52  error    'itemProperties' is not defined                                                    no-undef
  1439:5   error    'elem' is not defined                                                              no-undef
  1439:37  error    'itemProperties' is not defined                                                    no-undef
  1439:65  error    'itemProperties' is not defined                                                    no-undef
  1582:17  error    Strings must use singlequote                                                       quotes
  1584:1   error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs
  1588:22  error    Use `.includes()`, rather than `.indexOf()`, when checking for existence           unicorn/prefer-includes
  1588:50  error    Use `.includes()`, rather than `.indexOf()`, when checking for existence           unicorn/prefer-includes
  1595:21  error    Expected '===' and instead saw '=='                                                eqeqeq
  1596:4   error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs
  1612:8   error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs
  1614:10  error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs
  1616:10  error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs
  1617:10  error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs
  1617:24  error    Expected '===' and instead saw '=='                                                eqeqeq
  1618:12  error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs
  1619:10  error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs
  1624:10  error    Mixed spaces and tabs                                                              no-mixed-spaces-and-tabs

[NovemLinguae]

This patch breaks the warn -> select2 element in manual testing. Makes it fall back to a regular dropdown. Please fix :)

[IlyasLebleu]

Looking at it asap, thanks!