ComposeBox already specified autoFocus for the ComposeInput.
However, this didn't work because the dialog was disabled when the ComposeInput code tried to focus the textarea.
To fix this, tweak A11yDialog to look for the autofocus attribute when determining what to focus.
This is consistent with the behavior for native HTML dialogs.
Then, have ComposeInput set this attribute if it's in a dialog.
Fixes#1839.
* first attempt
* progress
* working
* working
* test timeago
* rm
* get timeago working
* reduce size
* fix whitespace
* more intl stuff
* more effort
* more work
* more progress
* more work
* more intl
* set lang=LOCALE
* flatten
* more work
* add ltr/rtl
* more work
* add comments
* yet more work
* still more work
* more work
* fix tests
* more test and string fixes
* fix test
* fix test
* fix test
* fix some more strings, add test
* fix snackbar
* fix }
* fix typo
* fix english
* measure perf
* start on french
* more work on french
* more french
* more french
* finish french
* fix some missing translations
* update readme
* fix test
* fix: update to latest sapper
fixes#416
* fix error and debug pages
* requestIdleCallback makes column switching feel way nicer than double rAF
* add export feature
* add better csp info
* workaround for sapper sub-page issue
* clarify in readme about exporting
* fix now config
* switch from rIC to triple raf
* style-loader is no longer used
* update theming guide
Nolan Lawson
James Teh
tobi