Fix textpane passing wrong length to getStyledText

Fixes CLIENT-165

Change-Id: I4c304112cc590b57965e9304b68a6cdbd63debd3
Reviewed-on: http://gerrit.dmdirc.com/1778
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Shane Mc Cormack <shane@dmdirc.com>

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

                 } else if (i == selectedRange.getStartLine()) {
                     //loop from start of range to the end
                     if (selectedRange.getStartPos() != -1) {
-                        selectedText.append(getText(line, selectedRange
-                                .getStartPos(), line.length(), styled));
+                        selectedText.append(getText(line,
+                                selectedRange.getStartPos(),
+                                Styliser.stipControlCodes(line).length(), styled));
                     }
                 } else if (i == selectedRange.getEndLine()) {
                     //loop from start to end of range