Returns the style range at the given offset.
<p>
Returns null if a LineStyleListener has been set or if a style is not set
for the offset.
Should not be called if a LineStyleListener has been set since the
listener maintains the styles.
</p>
@param offset the offset to return the style for.
0 <= offset < getCharCount() must be true.
@return a StyleRange with start is offset and length is 1, indicating
the style at the given offset. null if a LineStyleListener has been set
or if a style is not set for the given offset.
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
</ul>
@exception IllegalArgumentException <ul>
<li>ERROR_INVALID_ARGUMENT when the offset is invalid</li>
</ul>
Returns the style range at the given offset. <p> Returns null if a LineStyleListener has been set or if a style is not set for the offset. Should not be called if a LineStyleListener has been set since the listener maintains the styles. </p>
@param offset the offset to return the style for. 0 <= offset < getCharCount() must be true. @return a StyleRange with start is offset and length is 1, indicating the style at the given offset. null if a LineStyleListener has been set or if a style is not set for the given offset. @exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> </ul> @exception IllegalArgumentException <ul> <li>ERROR_INVALID_ARGUMENT when the offset is invalid</li> </ul>