panel: Only consider St.Widgets for corner buttons
We cannot syncronize styles with plain Clutter.Actors, so don't return them when looking for corner buttons. https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/1047
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@ -533,6 +533,9 @@ class PanelCorner extends St.DrawingArea {
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if (index < 0)
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return null;
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if (!(children[index] instanceof St.Widget))
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return null;
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if (!children[index].has_style_class_name('panel-menu') &&
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!children[index].has_style_class_name('panel-button'))
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return this._findRightmostButton(children[index]);
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@ -558,6 +561,9 @@ class PanelCorner extends St.DrawingArea {
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if (index == children.length)
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return null;
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if (!(children[index] instanceof St.Widget))
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return null;
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if (!children[index].has_style_class_name('panel-menu') &&
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!children[index].has_style_class_name('panel-button'))
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return this._findLeftmostButton(children[index]);
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