This is a support function for GListModel handling, by mirroring
the GlistModel::items-changed signal.
First, it "cuts" the values from @position to @removed from
the bitset. That is, it removes all those values and shifts
all larger values to the left by @removed places.
Then, it "pastes" new room into the bitset by shifting all values
larger than @position by @added spaces to the right. This frees
up space that can then be filled.
This is a support function for GListModel handling, by mirroring the GlistModel::items-changed signal.
First, it "cuts" the values from @position to @removed from the bitset. That is, it removes all those values and shifts all larger values to the left by @removed places.
Then, it "pastes" new room into the bitset by shifting all values larger than @position by @added spaces to the right. This frees up space that can then be filled.