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Change backspace behavior in align type equations

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When hitting backspace in the first position of a cell in mathed,
if the cell is part of an array, the whole array is dissolved
and the sole cell content pasted in the containing environment.

But if the cell is part of an eqnarray or align math hull type, the
cursor is simply (and unexpectedly) taken out of the whole equation,
which is left unchanged.

This patch makes backspace equivalent to the cursor left key in those
cases, while leaving the behavior unchanged in all other ones.

Fixes #11678
This commit is contained in:
Enrico Forestieri 2021-01-31 00:51:15 +01:00
parent d008ca2539
commit c79ec4114e
1 changed files with 14 additions and 3 deletions
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17
src/Cursor.cpp
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@ -1594,9 +1594,20 @@ bool Cursor::backspace(bool const force)
// [|], can not delete from inside
return false;
} else {
if (inMathed())
pullArg();
else
if (inMathed()) {
switch (inset().asInsetMath()->getType()) {
case hullEqnArray:
case hullAlign:
case hullFlAlign: {
FuncRequest cmd(LFUN_CHAR_BACKWARD);
this->dispatch(cmd);
break;
}
default:
pullArg();
break;
}
} else
popBackward();
return true;
}