Fixes issue 3776: Quick copy doesn't work for double/triple clicks

Change-Id: Id16f25b753c4c6568348c22e72017235dd1d442f
Reviewed-on: http://gerrit.dmdirc.com/881
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Shane Mc Cormack <shane@dmdirc.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/ui_swing/textpane/TextPaneCanvas.java

@@ -1,3 +1,4 @@
+
 /*
  * Copyright (c) 2006-2010 Chris Smith, Shane Mc Cormack, Gregory Holmes
  *
@@ -461,11 +462,15 @@ class TextPaneCanvas extends JPanel implements MouseInputListener,
                 selection.setEndLine(lineInfo.getLine());
                 selection.setStartPos(start);
                 selection.setEndPos(end);
+                textPane.copy();
+                textPane.clearSelection();
             } else if (e.getClickCount() == 3) {
                 selection.setStartLine(lineInfo.getLine());
                 selection.setEndLine(lineInfo.getLine());
                 selection.setStartPos(0);
                 selection.setEndPos(clickedText.length());
+                textPane.copy();
+                textPane.clearSelection();
             }
         }