no tab will be selected when children's length changed.#994

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Walker0125 wants to merge 1 commit intoptomasroos:masterfrom Walker0125:master

+6-2

Commits on Mar 26, 2019

fix bug: if new children's length is less than the old ones, no tab will be selected. This fix will select the 0 index tab when new children's length is less then the old ones.
Song0125
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