[XFree86] gnome-terminal text selection enhancement

[Robert T. Drury]

Using the mouse, I found reverse text selection (left motion) a problem 
- what I consider "correct" is to start a forward selection in the right 
half of the char cell, and a reverse selection in the left half of the 
char cell. This is how mozilla and gedit work, and I think irix terminal 
too.

Tested on multi-gnome-terminal-1.4.1 and appears to carry forward to 
zvtterm.c 1.161 in CVS.

in zvtterm.c,
zvt_term_button_press,
zvt_term_button_release,
zvt_term_motion_notify 
- add term->charwidth/2 in the numerator where converting x pixel 
position to x character position - this shift selection to right by 1/2 
char width

x = ( x - ( widget->style->klass->xthickness + PADDING ) + 
term->charwidth/2 ) / term->charwidth;

then, get rid of the call to vt_fix_selection in zvt_term_motion_notify
because it screws up selection and it seems to be unnecessary during motion


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