When Escape key is pressed, nsAutoCompleteController needs to restore last
string which was default value of the input or typed by the user. However,
somebody may change the value, e.g., an event listener which handles
Escape key. In this case, nsAutoCompleteController shouldn't restore the
last string.
Unfortunately, when JS sets input value, DOM "input" event won't be fired.
Therefore, nsAutoCompleteController doesn't have a chance to modify
mSearchString in this case. Therefore, nsAutoCompleteController needs to
store expected input string for checking if somebody modified the input value.
For solving this issue, this patch adds a new member, mSetValue which is
modified when the input value is modified by nsAutoCompleteController itself
or mSearchString is modified.
Even with this patch, if user temporarily selects an item of the popup and
JS sets same value as the selected item from JS, nsAutoCompleteController
restores the input value with mSearchString. However, this must be rare
case and I don't have idea to fix this issue with simple patches.
MozReview-Commit-ID: lig8c7xvD7
b93a0ce668