widget: ensure editor does not trim trailing whitespace

This commit makes the editor widget suppress the trimming of trailing whitespace
so that the spaces can be selected intuitively.

Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>

widget/editor.go

@@ -610,6 +610,7 @@ func (e *Editor) initBuffer() {
 	e.text.SingleLine = e.SingleLine
 	e.text.Mask = e.Mask
 	e.text.WrapPolicy = e.WrapPolicy
+	e.text.DisableSpaceTrim = true
 }
 
 // Update the state of the editor in response to input events. Update consumes editor