highlight_area()

[Moosems]

Fixes #19, #16

test:

from chlorophyll import CodeView
from tkinter import Tk

root = Tk()
codeview = CodeView(root)
codeview.pack()

for i in range(100):
    codeview.insert("end", "print()\n")

codeview.hightlight_area(1, 100)
root.mainloop()

[rdbende]

LGTM mostly

[Moosems]

New test:

from chlorophyll import CodeView
from tkinter import Tk
from pygments.lexers import PythonLexer

root = Tk()
codeview = CodeView(root, lexer=PythonLexer)
codeview.pack()

for i in range(100):
    codeview.insert("end", "print()\n")
codeview.insert("50.0", "\"\"\"\ntest\n\"\"\"\n")
codeview.highlight_area(25, 75)
root.mainloop()

[Moosems]

Black and Isort came up empty. Looks good to me, you approve?