Switching directly from one board to another using the favorites bar reused
the same boardBody template instance (currentBoard went A -> B, never null),
so boardBody.onRendered never fired again and the one-shot
Utils.setBackgroundImage() call never re-ran. The previous board's inline
background:url(...) on .board-wrapper stayed on screen. Switching via the
"all boards" list worked only because it destroys and re-creates boardBody.
Two-part fix:
- boardBody.onRendered now calls Utils.setBackgroundImage() inside a reactive
this.autorun(), so it recomputes on every board switch (and background edit).
It performs no DB writes, so there is no autorun write loop.
- setBackgroundImage() now clears any stale inline background when the new
board has no image, instead of only ever setting one. The decision is a
Meteor-free helper models/lib/boardBackground.js (computeBoardBackground),
unit tested (positive + negative) in tests/boardBackground.test.cjs. Board
color keeps being applied reactively via the .board-wrapper colorClass.
Thanks to dasarne and xet7.
