- Keep the Save button enabled at all times
- Show "*required" or "The password is invalid" to remind the user
- Show "Password (optional)" to indicate that it can remain unchanged, when modifying Wi-Fi configuration
Bug: 386897596
Bug: 402694144
Flag: EXEMPT bugfix
Test: Manual testing
atest SettingsUnitTests:AddNetworkFragmentTest
atest WifiConfigControllerTest \
WifiConfigController2Test \
WifiDialogActivityTest
Change-Id: I09b7684674ff376139565fcc196cde8d8d20a864