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81127d71f3
What could happen was: - user could right click on a line - this would trigger `disabled()` checks for each operation buttons - the line was not fully downloaded, so would return `disabled()` 'not_downloaded' (and also start download of the missing tiles) - then the tooltip would pop into existence, calling `tooltip()` - which calls `disabled()` again - but this time it's fine and the `disabled()` is false - so you'd see a greyed out button but the tooltip said everyting is ok and you can click the button anyway I fixed this by just caching the disabled test. This is probably ok anyway because these tests can be expensive, and then the user will see a consistent message like "The line is not yet fully downloaded". If the user clicks off the line and back onto it, iD will reenter select mode, rebuild the menu, redo the disabled test, and they will see the button enabled.