Let File Layers report errors with filesystem via node properties

Dmitry Kazakovrequested to merge
dkazakov/krita:kazakov/file-layer-warnings into master

Now the user can see an exclamation mark near the file layer's name when the layer fails to access/parse the linked file. The user can hover the exclamation mark and see what actually hapened.

BUG:446832

Testing package for Windows

Package: https://disk.yandex.ru/d/YCoD9kP_gMHbjA

Testing Plan

  1. Create an image with a File Layer
  2. While Krita is running, remove the linked file from the filesystem
    • in about 10 seconds a warning should appear
  3. Readd the file back to the filesystem
    • the warning should disappear quickly
  4. Replace the linked with some non-image data that Krita cannot open as an image
    • the warning should appear telling that the file could not be loaded
Edited by Dmitry Kazakov

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