Assembling started from an empty box, so replacing an instruction meant reading
it off the screen and retyping it, and tweaking one operand meant typing the
whole thing. It now opens with the current instruction already in it, selected,
so typing replaces it and editing is just editing.
Disassembled without symbol substitution for this, unlike what the view itself
shows: a branch displayed as a function name doesn't assemble back, and the
whole point of the prefill is that it's valid input.
Selection is only applied on this path. onChar() also seeds the box - with the
character the user just typed over an instruction - and there the text is the
start of what they're writing, not something to overwrite.
Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01GZq8ZtJmFY7bkX5FVkr3P9
Henrik RydgårdandClaude Opus 5
ebd2b4757f