Users can't reset their panel navigations

[edgarsi]

Use case: The user opens the picker popup, clicks on the month (switches mode to month panel), clicks some arrows (year changes), the user panics and wants to get back to original calendar view. The user clicks outside of the picker popup, causing the popup to close. Now the user expects to reopen it again in its original state.

Problem: The picker opens in the state it was left in. It opens the last used panel, not the default "date" panel. If defaultValue is unset, it opens the last year navigated to as well. This is a usability regression in ant-design 4. It was working fine in ant3.

Expected: When a user cancels date picking by closing and reopening a panel, all settings should be as they were before the user did anything. Users are easily confused and expect a complete cancel functionality.

Solution: Picker should create a new PickerPanel (e.g. by generating a new component's key). Alternatively, PickerPanel could expose a 'reset' method to set panel mode and inner view date back to their default values. The reset should be a side effect of Picker's 'triggerInnerOpen'. Same for RangePicker.