[3.2] [HTML5] Synchronous main, better persistence, handlers fixes, optional full screen. #42266
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Crated helper class in native/utils.js. Simplify code in OS/DisplayServer.
The engine now expects to emscripten FS to be setup and sync-ed before main is called. This is exposed via `Module["initFS"]` which also allows to setup multiple persistence paths (internal use only for now). Additionally, FS syncing is done **once** for every loop if at least one file in a persistent path was open for writing and closed, and if the FS is not syncing already. This should potentially fix issues reported by users where "autosave" would not work on the web (never calling `syncfs` because of too many writes).
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3.2 version of #42178 :
This PR has most of the things in #41097 (excluding the virtual keyboard support):
Plus, a rework of the initialization process to better handle file system synchronization (last commit, fixes #39643):
The engine now expects to emscripten FS to be setup and sync-ed before
main is called. This is exposed via
Module["initFS"]which also allowsto setup multiple persistence paths (internal use only for now).
Additionally, FS syncing is done once for every loop if at least one
file in a persistent path was open for writing and closed, and if the FS
is not syncing already.
This should potentially fix issues reported by users where "autosave"
would not work on the web (never calling
syncfsbecause of too manywrites).