Remove implicit `focus_set()` call in `FigureCanvasTkAgg.init`#30852

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Impaler343 wants to merge 2 commits intomatplotlib:mainfrom

Impaler343:focus_depr

Commits on Dec 13, 2025

Added API note, enhanced gallery example, applied fix

Impaler343
and
daniilS
committed

Commits on Dec 23, 2025

Tests modified with warnings
Impaler343
committed