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Don't try to guess a delta if a scroll valuator's state is unknown

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* src/xterm.c (x_get_scroll_valuator_delta): Return DBL_MAX if
the scroll valuator's value is unknown.
This commit is contained in:
Po Lu 2022-01-03 11:21:16 +08:00
parent 01047cf13f
commit f6501fded7
1 changed files with 5 additions and 4 deletions
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9
src/xterm.c
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@ -502,9 +502,10 @@ x_init_master_valuators (struct x_display_info *dpyinfo)
/* Return the delta of the scroll valuator VALUATOR_NUMBER under
DEVICE_ID in the display DPYINFO with VALUE. The valuator's
valuator will be set to VALUE afterwards. In case no scroll
valuator is found, or if device_id is not known to Emacs, DBL_MAX
is returned. Otherwise, the valuator is returned in
VALUATOR_RETURN. */
valuator is found, or if the valuator state is invalid (see the
comment under XI_Enter in handle_one_xevent), or if device_id is
not known to Emacs, DBL_MAX is returned. Otherwise, the valuator
is returned in VALUATOR_RETURN. */
static double
x_get_scroll_valuator_delta (struct x_display_info *dpyinfo, int device_id,
int valuator_number, double value,
@ -531,7 +532,7 @@ x_get_scroll_valuator_delta (struct x_display_info *dpyinfo, int device_id,
*valuator_return = sv;
unblock_input ();
return 0.0;
return DBL_MAX;
}
else
{