First access to the field happens before editor component is added
to component tree, and value was initialized to near-zero value.
Actual zoom factor will be set later in `setImageProvider`.

Using 0 instead of 1 helps to avoid blinking when editor is first shown.

https://ea.jetbrains.com/browser/ea_reports/2004373 NPE fix: do not continue if template is finished

It no longer rejects paths with symlinks/junctions, but checks that they do not point to UNC paths.

Added link to the description of the algorithm.

EA-105820 - assert: RefactoringDialog.show

Step definition could be injected to another step definition like fixture.

Now it's useless when there is searching by predicate

[gui-test] IDEA-CR-34414 GUI-126 Refactored wrappers around JTree to support searching by predicate and clicking without specifying the path twice

* The only usage in plugins is API Comparator, and it is broken long time ago.

* no custom implementations of `DiffContent` are left, so we can rely
  on default logic for `getNavigatable`, `getFile` and `getLineSeparator`

* All usages in plugins are using constructor,
  that was removed in 89a0440a