[historyView] "Search all" option for find toolbar
Sometimes one wants to find a commit by author, sometimes by comment.
Currently this requires the user to switch between those modes.
This change adds a new "All" mode, which just searches all fields. The
performance is good enough that this can be the default mode.
This also fixes a bug where cycling through the options by pressing on
the button would persist the wrong preference value.
Bug: 345410
Change-Id: I1fb6972fe5b4b30264aae1e7069942a363b58f05
Signed-off-by: Robin Stocker <robin@nibor.org>