sokol_app.h: Resize callback is never unregistered giving javascript errors

[edubart]

Problem

In HTML5 platform with html5_canvas_resize set to false, after sapp_run() finishes and you resize the Window, you will get lots of javascript errors, such as:

DOMException: Document.querySelector: '' is not a valid selector
    findEventTarget http://localhost:6931/test.js:1
    _emscripten_get_element_css_size http://localhost:6931/test.js:1
    uiEventHandlerFunc http://localhost:6931/test.js:1
    jsEventHandler http://localhost:6931/test.js:1
    registerOrRemoveHandler http://localhost:6931/test.js:1
    registerUiEventCallback http://localhost:6931/test.js:1
    _emscripten_set_resize_callback_on_thread http://localhost:6931/test.js:1
    _rivemu_start_record http://localhost:6931/test.js:1
    ccall http://localhost:6931/test.js:1
    rivemuRecord http://localhost:6931/test.html:155
    rivemuRecord http://localhost:6931/test.html:144
    rivemuInsertCartridge http://localhost:6931/test.html:136
    onclick http://localhost:6931/test.html:1
lockdown-install.js:1:94626

Solution

Adding this line to _sapp_emsc_unregister_eventhandlers fixes the issue:

emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, 0, true, 0);

Use case

I am trying to make a HTML page where you can test multiple sokol apps, each one app calls sapp_run() and take ownership of the canvas and at some point the app ends. To have this work properly sapp_run() should always cleanup nicely so the next sokol_run() can run.

[floooh]

Yep makes sense. Do you want to provide a PR?

[edubart]

Just made the PR #984 to fix that.

[floooh]

Thanks! PR has been merged. I'll write a small blurb in the changelog too.