Triple-click highlighting issue--Mac v1.6.6

Triple-click mouse line highlighting functionality is broken in 1.6.6

In prior versions the triple-click appears to have been detected on mouse button_down, which made it possible to highlight an entire line, keep the button down and highlight whole sections without having to carefully position the cursor. This is the standard behavior in other Mac programs.

Now it appears that mouse button_release is used, making it impossible to do this. Triple-click does highlight the line, but it can now only be used for one line. If you triple-click on a variable name, it wants to drag the text, not select the line. Using four-clicks does not fix the issue as it then wants to drag a whole line of text.

No source file or test is named. First reproduce the triple-click behavior in Arduino IDE 1.6.6 and compare it with an earlier version, then trace the mouse button-down and button-release handling in the editor. Done means triple-clicking selects a line while the button remains down and allows extending the selection across lines without dragging text.

Written by the indexing model from the issue text.