Fix applets showing a line or flat border when floating
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I hide the line that's drawn at the bottom of applets when they are floating (NOT system tray applets, which already had no line)
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I make sure applets know that they're meant to be floating by telling the panel to set the floating flag when the containment changes too; this is because it is first set when the containment is still
null
, so the applets didn't get the memo at all.
Edited by Niccolò Venerandi