#1350 Provide a mechanism to read EDGE_MULTILINE setting

[Kered13]

If edge mode is set to EDGE_LINE or EDGE_BACKGROUND then it is possible to get the edge column with SCI_GETEDGECOLUMN. However if the edge mode is set to EDGE_MULTILINE there is no way to read the current edge columns. There should be some mechanism for this.

One possibility I can think of (working within the constraints of SendMessage) is to have a message that takes a pointer to an array as an argument. If this pointer is null, return the current number of edges. If this pointer is non-null, then populate the pointed to array with the current edge columns.

Does this seem reasonable?

[Neil Hodgson]

Policy is to avoid pointer arguments as they are more difficult for scripting languages and there can be integer size (64-bit vs 32-bit) issues.

Define an index based approach with an out-of-bounds value for indices past the end or explicit number of edges call. Like the recent SCI_MARKERHANDLEFROMLINE and SCI_MARKERNUMBERFROMLINE addition [665c31].

[Neil Hodgson]

Committed implementation of SCI_GETMULTIEDGECOLUMN with [e72e8c] and [03c67a].

[Neil Hodgson]

Committed implementation of SCI_GETMULTIEDGECOLUMN with [e72e8c] and [03c67a].