tree 540f6fccb419f4ecde64015669583af6a46c64f9
parent 11b07c05ac5d2c3e9c4a4f5c83047091ed8e50bc
author James Cook <jamescook@google.com> 1425422414 -0800
committer James Cook <jamescook@google.com> 1426714601 -0700

Improve undo support for text entered with IME

Use span properties to detect:
* Composing text - don't record undo operations
* Completing a composition - record an insert undo operation
* Canceling a composition - don't record

Save the composition state on parcel/unparcel.

Stop using begin/end batch edit to try to detect when a TextWatcher
is modifying the text. IMEs trigger multiple InputFilter passes in
a single batch edit. Use SpannableStringBuilder to determine when
we're in a TextWatcher callback because it is the authority on that
state.

Fix a bug in undo manager where it doesn't forget undos correctly if
there are more than one in the stack.

Bug: 19332904
Change-Id: Iaa9b0b2a7bf6683302cc85e7616e5d5fcc9fa202