How forward search work?

[islercn]

i am not sure it is caused by LSP or LSP-TexLab or TexLab i cannot use forward search with "Alt+DoubleClick", what is the correct way? my config file:

	"texlab.forwardSearch.executable": "D:/Software/SumatraPDF/SumatraPDF.exe",
	"texlab.forwardSearch.args": [
		"-reuse-instance",
		"%p",
		"-forward-search",
		"%f",
		"%l"
	],