@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_RANGE when the offset is outside the valid range (< 0 or > getCharCount())</li>
</ul>
Returns the line height at the given offset.
@param offset the offset
@return line height in pixels
@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_RANGE when the offset is outside the valid range (< 0 or > getCharCount())</li> </ul>
@since 3.2