User/select_only_unique.py


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import sublime
import sublime_plugin


class SelectOnlyUniqueCommand(sublime_plugin.TextCommand):
    def run(self, edit):
        new_sels = []
        found_texts = set()

        for r in self.view.sel():
            text = self.view.substr(r)
            if text not in found_texts:
                found_texts.add(text)
                new_sels.append((r.a, r.b))

        self.view.sel().clear()
        self.view.sel().add_all([
            sublime.Region(a, b)
            for a, b in new_sels
        ])