Gimp Python插件加载图像禁用撤消历史记录

Question

我有一组我试图手动处理的图像，因此我编写了一个简单的插件来尝试并帮助减轻它的痛苦。图像按顺序编号。因此，当我完成一个图像处理时，我可以点击一个键组合，它会使用正确的名称保存文件并打开列表中的下一个。一切正常。

我对插件的问题是，对于新打开的图像，undo-redo历史记录不起作用。我不确定我是否正确加载它，或者是否有必须为启用撤消历史记录设置的内容。加载新图像时，撤消历史记录完全为空白，当我对图像进行更改时，在处理文件时没有添加任何新内容。这使得很难做任何事情，因为错误意味着重新开始。我正在使用最新的gimp版本2.8.18。

我是编写gimp插件的完全新手，并且是通过网络示例构建的，所以任何有助于弄清楚为什么会发生这种情况的帮助都会非常感激。这是我为插件编写的代码：

#!/usr/bin/python

from gimpfu import *
import os.path

def get_next_filename(filepath):
    #Now figure out the next image to load
    old_file = filepath.replace("\\", "/")
    file_info = old_file.split('/')
    #print file_info

    name = file_info[len(file_info) - 1].replace(".JPG", "").replace("P", "")
    print name

    next_num = int(name) + 1

    new_name = "P" + str(next_num) + ".JPG"
    print new_name

    file_info[len(file_info) - 1] = new_name
    s = "/"
    new_path = s.join(file_info)
    print new_path
    return new_path

def plugin_main(timg, tdrawable):
    print "orig filename: ", timg.filename
    new_filename = timg.filename.replace(".JPG", "_colored.JPG")
    print "new filename: ", new_filename
    layer = pdb.gimp_image_merge_visible_layers(timg, CLIP_TO_IMAGE)

    if not os.path.isfile(new_filename):
        pdb.gimp_file_save(timg, layer, new_filename, '?')
    else:
        pdb.gimp_message ("Failed to save segmented image. File " + new_filename + " already exists.")

    print "Closing image"
    #pdb.gimp_display_delete(gimp._id2display(0))

    #Try to load one of the next 5 consecutive image numbers.
    #If none found then quit plugin, else load it.
    new_path = timg.filename
    for i in range(0,5): 
        new_path = get_next_filename(new_path)

        if os.path.isfile(new_path):
            print new_path + " found. Loading it."
            img = pdb.file_jpeg_load(new_path, new_path)
            pdb.gimp_display_new(img)
            return  

    pdb.gimp_message ("No more consecutive images were found in the folder.")



register(
        "segmented_saver",
        "Saves a segmented image with the correct name and opens next image.",
        "Saves a segmented image with the correct name and opens next image.",
        "DC",
        "DC",
        "2016",
        "<Image>/Image/Save Segmented...",
        "RGB*, GRAY*",
        [],
        [],
        plugin_main)

main()