Remove workarounds of reactive attribute holder mounting
Related: !138 (merged)
Blocked until: https://github.com/Textualize/textual/pull/3065 goes to the next release of Textual
Edited by Mateusz Żebrak
Related: !138 (merged)
Blocked until: https://github.com/Textualize/textual/pull/3065 goes to the next release of Textual