Use canonicalPath instead of absolutePath for srcLink

This way a user can define "./" instead of an absolute path to the
root of the project dir (or a user can use ../ etc.). Thus:
- use canonicalPath in:
  - SourceLinkDefinitionImpl::parseSourceLinkDefinition
  - and DocumentationNode.appendSourceLink => here because if the
    config is deserialized we bypass parseSourceLinkDefinition
  - also use canonicalPath for the path of PsiElement

Moreover:
- make sure the comparison works for unix and windows paths
- fixes #289

1 files changed, 6 insertions, 0 deletions

diff --git a/core/testdata/sourceLinks/dummy.kt b/core/testdata/sourceLinks/dummy.kt
new file mode 100644
index 00000000..cbaffe7c
--- /dev/null
+++ b/core/testdata/sourceLinks/dummy.kt
@@ -0,0 +1,6 @@
+/**
+ * Some doc.
+ */
+fun foo(){
+
+}