doc/ts: desc. some limitation of full path module tags

doc/source/design/sticky-modules.rst

@@ -121,4 +121,14 @@ Current limitations
   - If specified swapped-on module is the generic module name, for instance *foo*
   - ``switch`` sub-command raises an error even if the sticky module is the default version (either implicit or explicitly set) for this module
 
+- When swapping a sticky module defined over a full path modulefile by another
+  in different modulepath but with same module name and version
+
+  - This switched-on module is currently considered as the sticky module
+    reloading
+
+- When swapping a sticky module by itself but specified as full path module
+  swap command is not able to detect same module is reloading
+
+
 .. vim:set tabstop=2 shiftwidth=2 expandtab autoindent:

testsuite/modules.50-cmds/463-sticky-full-path.exp

@@ -156,6 +156,28 @@ set tserr [msg_switch {tag/1.1 <sS>} foo/2.0 $err_superstickyunload]
 testouterr_cmd sh {switch tag/1.1 foo/2.0} ERR $tserr
 
 
+setenv_var TESTSUITE_FPMOD_TAG sticky1
+setenv_loaded_module [list tag/1.0] [list $mp/tag/1.0]
+setenv_var __MODULES_LMTAG tag/1.0&sticky
+setenv_path_var MODULEPATH $modpath.3:$mp
+
+set ans [list]
+lappend ans [list set _LMFILES_ $modpath.3/tag/1.0]
+lappend ans [list set LOADEDMODULES tag/1.0]
+lappend ans [list set __MODULES_LMTAG tag/1.0&sticky]
+# FIXME: sticky tag applies to full path module, should not escape to
+# another module with same name but in different modulepath
+testouterr_cmd sh {switch tag/1.0} $ans {}
+
+# FIXME: sticky tag applies to full path module, should be able to reload
+# when specified full path
+setenv_var MODULES_ADVANCED_VERSION_SPEC 0
+set tserr [msg_switch {tag/1.0 <S>} $mp/tag/1.0 $err_stickyunload]
+testouterr_cmd sh "switch $mp/tag/1.0" ERR $tserr
+setenv_path_var MODULEPATH $mp
+unsetenv_var MODULES_ADVANCED_VERSION_SPEC
+
+
 #
 # restore
 #