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09c809003b
Fixes #195 Fixes #277 Fixes #455 * Read `XMODIFIERS` explicitly/directly instead of calling `XSetLocaleModifiers` with an empty string. This is useful for debugging purposes, and more clear to read and handle. * Fallback to local input method if the one specified in `XMODIFIERS` is later closed on the server end (i.e. if ibus/fcitx is terminated). Previously, that would cause the event loop to freeze and usually also segfault. * If using the fallback input method, respond to the `XMODIFIERS` input method later becoming available. This means that the input method restarting is handled, and that even if the program was started while ibus/fcitx/etc. was unavailable, it will start using it as soon as it becomes available. * Only one input method is opened for the whole event loop, with each window having its own input context. * IME works completely out of the box now, no longer requiring application developers to call `setlocale` or `XSetLocaleModifiers`. * Detailed error messages are provided if no input method could be opened. However, no information is provided to the user if their intended `XMODIFIERS` input method failed to open but the fallbacks (which will ostensibly always succeed) succeeded; in my opinion, this is something that is best filled by adding a logging feature to winit.