4.13.9

🐛 Bug Fix

• Mobile / adaptive toolbar: with a custom buttons list and the default buttonsMD/buttonsSM/buttonsXS, resizing the editor narrower surfaced buttons that were never requested — the breakpoint sets are group-based defaults independent of buttons. The responsive breakpoint set is now constrained to buttons: resizing only ever drops buttons, never adds ones outside buttons. Set buttonsMD/buttonsSM/buttonsXS explicitly if you want a different per-breakpoint set. The default configuration (where buttons is the full superset) is unchanged. Fixes #1389.