Native overlay for switching input methods

[hanaral]

Problem

Currently the input method itself handles the overlay popup (such as with mozc) which doesn't fit the elementary style or level of design quality (it doesn't have a border, and images for methods such as mozc are low-res. etc)

The overlay also seems to have a mind of its own and doesn't update the indicator, making it impossible to judge what you're using (this is worthy of its own issue)

Proposal

Disable the input methods own builtin keybindings and create a native one that is styled with the elementary design language. Probably with a popup bubble like volume and brightness, which would match their 'system' function.

Prior Art