[REF] *: use less string.split

[VincentSchippefilt]

In most cases, when we want to split a string in exactly 1 or 2 parts, using indexOf(delimiter) is faster than split.

updated code like

const index = xc.lastIndexOf("!")
if (index !== -1) {
  xc = xc.slice(index + 1)
}

is 2x faster than the original:

if (ref.includes("!")) {
  ref = ref.split("!").at(-1)
}

Description:

description of this task, what is implemented and why it is implemented that way.

Task: : TASK_ID

review checklist

• feature is organized in plugin, or UI components
• support of duplicate sheet (deep copy)
• in model/core: ranges are Range object, and can be adapted (adaptRanges)
• in model/UI: ranges are strings (to show the user)
• undo-able commands (uses this.history.update)
• multiuser-able commands (has inverse commands and transformations where needed)
• new/updated/removed commands are documented
• exportable in excel
• translations (_t("qmsdf %s", abc))
• unit tested
• clean commented code
• track breaking changes
• doc is rebuild (npm run doc)
• status is correct in Odoo

[robodoo]

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