[Super Editor Web BUG] -Inconsistent Tab Deletion Behavior on First Line and Between Nodes

[isaacadariku]

When trying to delete a tab in certain scenarios, the behaviour is inconsistent:

1. If the tab is at the beginning of the sentence and is on the first line, it cannot be deleted.
2. When deleting a tab between nodes, the node itself is deleted, and its content is appended to the previous node instead of just removing the tab.

Package Version
super_editor, stable branch

User Info
Reflection.app

To Reproduce

1. First-Line Tab Issue

• Start with a sentence on the first line with a tab at the beginning.
• Try to delete the tab with backspace.

2. Between-Nodes Tab Issue

• Place the cursor at the start of a node after a tab.
• Press backspace or delete to remove the tab.

Actual behaviour

• The tab at the beginning of the first line cannot be deleted.
• Deleting a tab between nodes removes the node and appends its content to the previous node.

Expected behaviour

• The tab at the beginning of the first line should be deleted.
• Deleting a tab between nodes should only remove the tab without merging nodes.

Platform
Web (Chrome)

Flutter version
Flutter 3.24.4

Videos
https://github.com/user-attachments/assets/58bd4ff7-a8c5-4408-b10e-cd30a194f9ed