Makes the current input source (language) indicator uppercase. Works with IBus input method editors, too.
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EGO-L-003 warning
signals connected by extension should be disconnected in disable()
Signals assigned in `enable()` are missing matching disconnect calls in `disable()` or its helper methods.
Uppercase Input Source Indicator
InputSourceManagerMonitor.js:54
this._inputSourceManagerSignalHandlerId = inputSourceManager.connect(signalName, (inputSourceManager) => signalCallback(inputSourceManager))