[TxMt] Text selection

[James Andrews]

Hi Allan et al,

I have a small request: Following the recent enhancement allowing you 
to enlarge a selection by using shift in combination with the arrow 
keys, it would be nice if similar behaviour was exhibited when using 
the mouse.

To clarify, I'd like to be able to double click on a word, hold the 
shift key and then single click outside the selection to enlarge it. At 
present, when using the mouse rather than keys to enlarge the 
selection, it always takes the start of the selection as the insert 
point rather than switching the insertion point based on whether the 
new selection point is before or after the current selection.

This means that trying to enlarge a selection by shift-clicking before 
a selection actually results in removing the existing selection rather 
than enlarging it.

Thank you for your time.
James