Fix pin/unpin rows of gant/time chart

[theibhir]

Bug Description:

When pining a row with id 2 the duplicated id is -1 ( 2 XOR -3 = -1) which is the parent id of the tree.
Since we already have an id of -1 as a parent tree the duplicated id does not get added to the tree list therefore the mapping breaks.

Steps to Reproduce:

1. Pin a row that has an id of 2.
2. It will go up but you won't be able to unpin it from the top.

Additional Information

• Operating System: Linux
• VSCode Version: Dev