Fix the missing history event problem.

[ag/8009931 is to fix the missing event problem and it get reverted in ag/15961577.
Now revert the change that causes the problem.]

Make a copy of mHistoryCur and add the copy to history buffer after
starting a new history file.

Bug: 230799882
Test: ag/8009931 reproduce steps.
Change-Id: If9339ed5182b65b9c59c119894e4f317b2e5751c