v0.15.4 Low Earth Orbit

New:

Multiplayer rooms can now have passwords. Also, all players can open a large room.
UI adjustments to room list screen
New mechanic of "mis-hard-drop interrupt delay" (what's that?)

Changed:

Multiplayer: 0.15.4 is backwards compatible with 0.15.2/3/4 rooms
Reset in custom game will now reset field, sequence and mission too
Save success message will not always appear
Responds to long presses better
When a widget is hidden, it will lose focus
Tweak to input box border style
Changed custom mode default BG and music
Applet "Tap": no longer treats two mouse buttons as the same button
20G extreme difficulty: 400 to 500 no longer has a unique background
All mods will now unrank your game

Code infrastructure:

MES module: when an error happens with saving file or parsing JSON, the error message will now show where in the code the error occurred
Multiplayer: room readiness update condition changed; invalid states will appear less often
Widget module update, improved experience
Minor improvements to performance of ws module

Fixed:

C4W mode always having alarm
around 1 in 30 chance to wrongfully play near death sound after death
DOGC module crashing canvas larger than system allows
Weird message format when server sends error or warning
Pasting invalid sequence causes subsequent errors
When enabling 3D blocks, line clear effect also stacked
When HOLD disabled, the on-screen button doesn't disappear
Tech modes: grading was wrong
After entering custom -> clear mode, it will no longer revert to regular endless mode
After clicking multiplayer, it used to be able to go to other scenes and cause issues
ws connection process can be interrupted by read
ws -> trigChn keeps pushing data, occupying memory