Refactor `RoomInputbar`

[emmettlu]

Currently, RoomInputbar is at the same level in the widget tree as replying_preview, location_preview and editing_pane, they all are inside the keyboard_view:

robrix/src/home/room_screen.rs

Line 619 in 7f68065

keyboard_view = <KeyboardView> {

To avoid more and more bloat, duplicate code written on matching MessageAction, it is time to make replying_preview, editing_pane and location_preview a widget of RoomInputBar seperately:

robrix/src/home/room_screen.rs

Line 1780 in 7f68065

match action.as_widget_action().widget_uid_eq(room_screen_widget_uid).cast() {

• Step1, hide other widgets (visible to be false) when any one of the three new widgets is about to show, e.g., when replying_preview is about to be shown, if any one of editing_pane and location_preview is already opened, and then save its state some where and hide they two widget.

• Step2, after user finished one widget, the previous widget should be reopened with its latest state we saved some where automatically.

[kevinaboos]

Thanks for filing this Aarav. I plan to work on this myself, hopefully towards the end of June.

[kevinaboos]

Waiting on the mentioning users feature to be complete, as that will affect how we implement this redesign.

Blocked on #496

[kevinaboos]

I am working on this as part of an effort to use Makepad's new min/max Fit size bounds to cap the height of the RoomInputBar at 75% of the RoomScreen's height.