debugger - performance, interface, bugs, etc.

[evancz]

This is a meta issue, designed to be a central home for related problems. If you want to report something, just open a new issue. Don't worry about searching for duplicates. If you make a great issue with a great SSCCE, it is always valuable!

Performance

The debugger currently unrolls your model into an expando whenever the debug panel is open. This can cause performance issues with very large models:

• Large lists - #90, #86, #80
• Large arrays - https://github.com/elm-lang/elm-make/issues/145
• Image data - #85

Visuals

• #83 - Show more Model based on screen size. Dynamic text layout is probably very expensive.
• #49 - Have a way to show more Msg information
• #100 - Controls get covered by elements with a higher z-index
• #66 - Have a way to return to initial state before Msgs start
• #102 - Remember open/closed expando state better
• #79 - Have a way to group related messages (progress in #77)
• #111 - Multiple debuggable apps on one page, external styles affect controls

Bugs

• Export of Date does not work right, import fails - #71, #53
• Something about detecting bad message types - #97

Subjective

• #52 - If you compile with --debug and embed in your own HTML that does not specify UTF8, things will look weird in the debugger. Maybe there's a way to resolve this.