Add Missing PDF Test File and Fix Modified Date Not Getting Set on Manual Lint Right After File Content Change

[pjkaufman]

Fixes #1267

There was a bug reported that indicated that there was an issue where if a user had the settings for adding the date modified x seconds after a file change was made and right after editing a file they ran the Linter, even if no change was made, the modified date would not get added once the Linter ran. The reason was that the Linter was saving a cached version of the text to know what was changed to make sure it only added the date modified as needed. However it did not skip updating the text if the Linter did not update the file. Thus when it looked for a change between the current text in the Obsidian cache and what the Linter said the original file contents was when the user/Linter last made an update it would say that there was no change.

Changes Made:

• Added the dummy pdf for testing purposes
• Only added the updated file contents to the Linter cache for files that should have a date modified potentially added after x seconds when the Linter made a change to the text in question