是否可以在不移动光标的情况下复制高品质文本中的行？

是的，有可能。虽然您必须为此做一个插件。
我试图这样做，所以我并不是说这是有史以来最简单的方法，但是它可以工作。

这是代码片段：

import sublime_plugin

class PromptCopyLineCommand(sublime_plugin.TextCommand):
    def run(self, edit):
        # prompt fo the line # to copy
        self.view.window().show_input_panel(
            "Enter the line you want to copy: ",
            '',
            self.on_done,  # on_done
            None,          # on_change
            None           # on_cancel
        )

    def on_done(self, numLine):
        if not numLine.isnumeric():
            # if input is not a number, prompt again
            self.view.run_command('prompt_copy_line')
            return
        else:
            numLine = int(numLine)

        # NOL is the number of line in the file
        NOL = self.view.rowcol(self.view.size())[0] + 1
        # if the line # is not valid
        # e.g. 0 or less, or more that the number of line in the file
        if numLine < 1 or numLine > NOL:
            # prompt again
            self.view.run_command('prompt_copy_line')
        else:
            # retrieve the content of numLine
            view = self.view
            point = view.text_point(numLine-1, 0)
            line = view.line(point)
            line = view.substr(line)
            # do the actual copy
            self.view.run_command("copy_line", {"string": line})

class CopyLineCommand(sublime_plugin.TextCommand):
    def run(self, edit, string):
        # retrieve current offset
        current_pos = self.view.sel()[0].begin()
        # retrieve current line number
        CL = self.view.rowcol(current_pos)[0]
        # retrieve offset of the BOL
        offset_BOL = self.view.text_point(CL, 0)
        self.view.insert(edit, offset_BOL, string+'\n')

只需将其保存在Package/User/（例如CopyLine.py）下的python文件中，
您还可以为其定义快捷方式，如下所示：

{ "keys": ["ctrl+shift+c"], "command": "prompt_copy_line"}

如果对此有任何疑问，请询问。

PS：演示