Bug 42009 [KeyBindings] Ctrl+Shift+F switches input mode in KeySequenceText on GTK
Some key strokes shift the input mode by default in GTK, which breaks the way the KeySequenceText widget is supposed to work. One example is Ctrl+Shift+F. Instead of the desired character, a strange other character is inserted, and the key sequence is not modified. This character cannot be deleted. STEPS TO REPRODUCE: 1.) Open the KeysPreferencePage and change focus to the KeySequenceText widget. 2.) Type Ctrl+Shift+F ACTUAL RESULTS: An underlined 'F' is inserted in the text widget, and the key sequence is not affected. EXPECTED RESULTS: Ctrl+Shift+F should be inserted, and the key sequence updated.
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ActionContributionItem.java
}
	/**
	 * Returns <code>true</code> if this item is allowed to enable,
	 * <code>false</code> otherwise.
	 * 
	 * @return if this item is allowed to be enabled
	 * @since 2.0
	 */
	protected boolean isEnabledAllowed() {
		if (getParent() == null)
			return true;
		Boolean value = getParent().getOverrides().getEnabled(this);
		return (value == null) ? true : value.booleanValue();
	}
	/**
	 * The <code>ActionContributionItem</code> implementation of this 
	 * <code>ContributionItem</code> method extends the super implementation
	 * by also checking whether the command corresponding to this action is active.
	 */
	public boolean isVisible() {
		return super.isVisible() && isCommandActive();
	}
	/**
	 * Sets the presentation mode, which is the bitwise-or of the 
	 * <code>MODE_*</code> constants.
	 * 
	 * @return the presentation mode settings
	 * 
	 * @since 3.0
	 */