How can I launch some custom gui_qt tool from an extension plugin?

[user202729]

(title.)

Such as the spectra lexer or the plugin manager.

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Remark: this was for #1323 , but given this (there's no simple way), it might be better to just launch a subprocess.

[user202729]

For lookup (or suggestions, with some pull request merged), StenoEngine.send_engine_command might work.

For the rest, there's this method. This is less bad than the previous method (no private member access!), but still relies on the structure of the GUI and QApplication.instance():

from PyQt5.QtWidgets import QAction, QApplication
from plover.gui_qt.main_window import MainWindow
main_window,=[x for x in QApplication.instance().topLevelWidgets() if isinstance(x, MainWindow)]
action,=[x
	for x in main_window.toolbar.children()
	if isinstance(x, QAction) and x.text()=="Suggestions"
	]
action.triggered.emit()

By the way, you can hide some buttons by right-clicking at the toolbar and select one of them, although this method still works correctly in that case.