Feature to display multiple sizes of text and images, as well as variable-length strings

[cxxxr]

Currently, text buffers are designed with the assumption that only terminal-based fixed-length strings will be displayed.

In order to be able to render markdown and display graphical text in the buffer in the future, I would like the following three features

• Multiple size text
  Feature to display text of multiple sizes on a single buffer #853
• Image
• variable length string

[Dima-369]

I am really looking forward to this since my default font in Emacs is a variable pitch font and I only revert to a monospaced font in buffers where absolutely needed for alignment or other reasons. Inserting images would be really cool for many use-cases in combination with SDL2 (and the other GUI backends) - I envision it also being more flexible than the image handling in Emacs :)