Revisit comment for todo of T65805998, validate there's nothing to wo…

…rry about

Summary:
Double-checked the `getRangeAt` here. Turns out we have nothing to worry about, this won't throw.

Updated the comment to reflect so. Not deleting it in case someone in the future wonders about this.

Reviewed By: claudiopro

Differential Revision: D21604262

fbshipit-source-id: 826169bbf060312b8feb4a5e6e1ebcdd5603f7ef

src/component/handlers/edit/commands/keyCommandBackspaceToStartOfLine.js

@@ -33,9 +33,10 @@ function keyCommandBackspaceToStartOfLine(
       }
       const {ownerDocument} = e.currentTarget;
       const domSelection: SelectionObject = ownerDocument.defaultView.getSelection();
-      // TODO(T65805998): Noticed this while flowifiying: this could throw if nothing is
-      // selected. Not doing it now to keep my flowification diff from altering
-      // behaviour, but we should be safe and handle that case eventually.
+      // getRangeAt can technically throw if there's no selection, but we know
+      // there is one here because text editor has focus (the cursor is a
+      // selection of length 0). Therefore, we don't need to wrap this in a
+      // try-catch block.
       let range = domSelection.getRangeAt(0);
       range = expandRangeToStartOfLine(range);