Fix width becoming fixed to 0 if initialized when hidden by parent element #5502
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Related to #3292, #3817, #3278, #291, plus other duplicates.
Credit for the fix to resizeSearch() goes to @brandonhall of #3292.
I know that this may not give exactly the same result as when select2 is initialized while it is visible, but I really cannot tell what is a betterchoice than defaulting to 100% width. This is already 7 years old, so I hope it'll be fixed someday.
Between some offered solutions like #3292 and #4898, jQuery used to have a bug that resulted in width becoming 100px.
Originally posted by me in #3817:
As for test cases: I don't know how to test for this because it is faulty behaviour, not that the logic was wrong.
#5259 contains a test case that will exhibit this bug. You can refer to this fiddle as well: https://jsfiddle.net/NozomiTypeR/6pLzy1ak/44/