Debugging a different cell with the same variables doesn't update the variables view

[kimadeline]

Testing #10184

Probably the same root cause as #10187

1. Add 2 cells:

# %%
a = 1234
b = 1
print(a)
c = a + b
print(c)

# %%
a = 3333
b = 3
print(a)
c = a - b
print(c)

2. Debug the first cell, see that a, b and c appear in the variables view once debugging is done
3. Debug the second cell, notice that a, b and c are not updated until after debugging is done

[greazer]

Most likely fixed in recent bits.