Cannot open (modal) Preferences dialog when running a second instance of application
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Open gnome-calculator.
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Change mode to programming mode.
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Set word-size to 64-bits in the preferences.
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Close gnome-calculator.
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Open gnome-calculator.
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Open gnome-calculator once again.
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Set word-size to 32-bits in the preferences of the FIRST gnome-calculator.
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Set word-size to 32-bits in the preferences of the SECOND gnome-calculator.
It's impossible to do the last step. You can see that the preferences of the FIRST gnome-calculator will be opened and you cannot change any preferences of the SECOND gnome-calculator. E.g. you cannot change word-size to 32-bits in the SECOND gnome-calculator in the preferences to do your calculations.