Using shift-alt-left/right key, I can select text word by word. The behavior is the newly implemented one: if I select text toward the left, and then use the right key, it narrows the selection (instead of extending it toward the right).
Using the shift-cmd-left/right key, I can select text up to the end of the line. However, the behavior is the old one: if I select toward the left and then toward the right (releasing the cmd key or not) the selection extends toward the right.
I think this is the standard behavior recommended by Apple. I observe the same behavior in TextEdit. If your cursor is in the middle of a line and you press shift-cmd-left, the left part of the line is selected. Then you press shift-cmd-right and the right part of the line is additionally selected, so that the entire line is now selected. I see that TextWrangler on the contrary toggles the left and the right parts of the line when you press successively shift-cmd-left and shift-cmd-right. The current behavior is the one implemented by the Cocoa text engine: I tried to remove Alpha's definitions and still I get the same behavior (which means that we do not even have to bother about these key bindings in AlphaTcl because we have them for free).
Additional remark: AlphaX did the same.
Or did I miss your point ?
Resolving as WONTFIX since we agreed that this is the expected behavior.