# st

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    commit eae31a532e1c3249abe3fe0dbce286cac263832f
    parent cc2ea3147accc342f4d411b42c8cae5b883b1224
    Author: Michael Forney <mforney@mforney.org>
    Date:   Thu, 25 Jul 2013 16:19:19 -0700

    Fix some bugs in mouse tracking logic

    * Button number in X10 mode:

      I believe the button - 1 came from "C b is button - 1" from [0].
      However, above this section, it states

        "Normally, parameters (such as pointer poisition and button number)
         for all mouse tracking escape sequences generated by xterm encode
         numeric parameters in a single character as value+32. For example, !
         specifies the value 1."

      Also, from the description of SGR,

        "The encoded button value in this case does not add 32 since that
         was useful only in the X10 scheme for ensuring that the byte
         containing the button value is a printable code."

      This suggests that we should still add 32 to the button value when in
      MODE_MOUSEX10.

    * No button release reporting in X10 mode:

        "X10 compatibility mode sends an escape sequence only on button press,
         encoding the location and the mouse button pressed."

    * Fix MODE_MOUSEMOTION:

      Currently, motion reporting is skipped when oldbutton == 3
      (corresponding to no button being pressed). However, oldbutton is
      only set on a button press, which will never be 3.

    [0]: http://invisible-island.net/xterm/ctlseqs/ctlseqs.html

    Diffstat:
    Mst.c | 22+++++++++++++---------

    1 file changed, 13 insertions(+), 9 deletions(-)
    diff --git a/st.c b/st.c
    @@ -823,18 +823,23 @@ mousereport(XEvent *e) {
     		button = oldbutton + 32;
     		ox = x;
     		oy = y;
    -	} else if(!IS_SET(MODE_MOUSESGR)
    -			&& (e->xbutton.type == ButtonRelease
    -				|| button == AnyButton)) {
    -		button = 3;
     	} else {
    -		button -= Button1;
    -		if(button >= 3)
    -			button += 64 - 3;
    +		if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
    +			button = 3;
    +		} else {
    +			button -= Button1;
    +			if(button >= 3)
    +				button += 64 - 3;
    +		}
     		if(e->xbutton.type == ButtonPress) {
     			oldbutton = button;
     			ox = x;
     			oy = y;
    +		} else if(e->xbutton.type == ButtonRelease) {
    +			oldbutton = 3;
    +			/* MODE_MOUSEX10: no button release reporting */
    +			if(IS_SET(MODE_MOUSEX10))
    +				return;
     		}
     	}

    @@ -851,8 +856,7 @@ mousereport(XEvent *e) {
     				e->xbutton.type == ButtonRelease ? 'm' : 'M');
     	} else if(x < 223 && y < 223) {
     		len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
    -				IS_SET(MODE_MOUSEX10)? button-1 : 32+button,
    -				32+x+1, 32+y+1);
    +				32+button, 32+x+1, 32+y+1);
     	} else {
     		return;
     	}