Manage Composer height with overridable methods (#1272)
Manage Composer height with overridable methods (#1272)

* Manage Composer height in a separate class with overridable methods

* Use a computed method

* Keep everything in Composer.js

* Drop usage of computed property for the Composer height
Because the Composer height also depends on the page height and is rarely called without position, height or page height changing anyway

datitisev/core,flarum/core,datitisev/core,flarum/core,malayladu/core,malayladu/core,malayladu/core,flarum/core,malayladu/core,datitisev/core,datitisev/core