m2e: incorrect error locations in Eclipse

[VsevolodGolovanov]

Eclipse Problems view shows:

which is misleading, because if open the description (or Ctrl+C the error row) then you'd see

Description Resource Path Location Type
Error: Undefined variable: "$i".
on line 303 of ../../../argus/rep/TechService-3.20/workspace/server-app/inf-modules/webui/src/main/sass/p/_dataList.scss
from line 97 of ../../../argus/rep/TechService-3.20/workspace/server-app/inf-modules/webui/src/main/sass/argus.scss

*****************************************/
------------------------------------------^
(com.github.warmuuh:libsass-maven-plugin:0.2.10-libsass_3.5.3:compile:default-cli:generate-resources) argus.scss /webui/src/main/sass line 303 Maven Build Participant Problem

So location was correct in Problems view, but not the file. The file shown (argus.scss) is the one that imports everything.

Related problem: double clicking the error opens the wrong file, the importing one.

Error reporting should be smarter and specify the file immediately containing the error.