After version 2.6.13 installed LESS depended files only compiled if saved file do not have "errors".
For example:
1) There's _buttons.less file which should not be compiled on save. File _buttons.less uses variables from separate file _variables.less which is not imported in _buttons.less but imported in up-level theme.less. So _buttons.less will produce error on compilation.
2) There's theme.less file which imports _buttons.less, _variables.less etc. and can compiled without any errors.
3) If theme.less is saved then it's compiled. But if _buttons.less is saved then depended theme.less is not compiled.
Before 2.6.13 there was no problems with compiling depended files.
I'm also experiencing this issue. The file where the variable is used doesn't compile due to the error, so the main file does not compile unless I save it directly.
After version 2.6.13 installed LESS depended files only compiled if saved file do not have "errors".
For example: 1) There's _buttons.less file which should not be compiled on save. File _buttons.less uses variables from separate file _variables.less which is not imported in _buttons.less but imported in up-level theme.less. So _buttons.less will produce error on compilation. 2) There's theme.less file which imports _buttons.less, _variables.less etc. and can compiled without any errors. 3) If theme.less is saved then it's compiled. But if _buttons.less is saved then depended theme.less is not compiled.
Before 2.6.13 there was no problems with compiling depended files.