tools.vpm: improve version detection of installed modules (#19933)

cmd/tools/vpm/common.v

@@ -95,7 +95,7 @@ fn parse_query(query []string) ([]Module, []Module) {
 				mut details := ''
 				if resp := http.head('${info.url}/issues/new') {
 					if resp.status_code == 200 {
-						issue_tmpl_url := '${info.url}/issues/new?title=Missing%20Manifest&body=${info.name}%20is%20missing%20a%20manifest,%20please%20consider%20adding%20a%20v.mod%20file%20with%20the%20modules%20metadta.'
+						issue_tmpl_url := '${info.url}/issues/new?title=Missing%20Manifest&body=${info.name}%20is%20missing%20a%20manifest,%20please%20consider%20adding%20a%20v.mod%20file%20with%20the%20modules%20metadata.'
 						details = 'Help to ensure future-compatibility by adding a `v.mod` file or opening an issue at:\n`${issue_tmpl_url}`'
 					}
 				}
@@ -110,9 +110,23 @@ fn parse_query(query []string) ([]Module, []Module) {
 			}
 		}
 		mod.version = version
-		if v := os.execute_opt('git ls-remote --tags ${mod.install_path}') {
+		if refs := os.execute_opt('git ls-remote --refs ${mod.install_path}') {
 			mod.is_installed = true
-			mod.installed_version = v.output.all_after_last('/').trim_space()
+			// In case the head just temporarily matches a tag, make sure that there
+			// really is a version installation before adding it as `installed_version`.
+			// NOTE: can be refined for branch installations. E.g., for `sdl`.
+			if refs.output.contains('refs/tags/') {
+				tag := refs.output.all_after_last('refs/tags/').trim_space()
+				head := if refs.output.contains('refs/heads/') {
+					refs.output.all_after_last('refs/heads/').trim_space()
+				} else {
+					tag
+				}
+				vpm_log(@FILE_LINE, @FN, 'head: ${head}, tag: ${tag}')
+				if tag == head {
+					mod.installed_version = tag
+				}
+			}
 		}
 		if mod.is_external {
 			external_modules << mod