Fix #113154: Improved Cursor Step Error Handling #113172
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Reference: blender/blender#113172
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Allow
BLI_str_cursor_step_bounds_utf8
to handle being called with -1for
pos
, which can sometimes happen.In this complaint, double-clicking on that data-block selector, it is a
UI_BTYPE_SEARCH_MENU
so we callui_do_but_TEX
. It has a blank str and its pos has a value of -1. It makes it to the event handling for KM_DBL_CLICK inui_do_but_textedit
. There it callsBLI_str_cursor_step_bounds_utf8
with a blank string and pos of -1. Becausepos < str_maxlen
we callcursor_delim_type_utf8
where the cast to size_t turns the -1 into maxint64, which causes the assert inBLI_str_utf8_as_unicode_step_or_error
.To my eye the only part actually misbehaving is
BLI_str_cursor_step_bounds_utf8
. This PR just makes it handle pos being negative. And then an assert is added tocursor_delim_type_utf8
that it never get a negative pos.Thanks for looking into this, committed an alternate fix:
26bb029ad8
.As cursor manipulation happens in a few isolated places, I'd rather assume the input position is always valid.
If there is some risk the input is out of range the caller can clamp.
Otherwise there is the risk of invalid cursor positions relying on cursor stepping to correct/clamp the cursor position.
In this case the press event wasn't inside the button, leaving
but->pos
set to -1, so calling word selection didn't make sense, now fixed.Pull request closed