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Text alignment and indentation are being exposed as object attributes to
support IA2 and minimize work needed to calculate attributes which can
only apply to an entire object. However, ATK treats alignment as a text
attribute and platform ATs expect text-attribute-changed events (there
is no object-attribute-changed event in ATK). Therefore, fire an AtkText
text-attribute-changed event to notify ATs when either of these text
properties change. It is up to platform ATs to check object attributes
for these properties.

Bug: 1108872

AX-Relnotes: Orca now includes alignment and indentation when its font-
announcement command is used in Chrome/Chromium. It will be possible for
Orca to add support for presentation of changes to these properties.

Change-Id: I971777ba4a5f672bf129a4687ff2c54c250c41f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343267
Commit-Queue: Joanmarie Diggs <jdiggs@igalia.com>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801815}