[lsp] Move example file for interactive lsp-mode test

tests/test_lsp_mode_in_emacs/Makefile

@@ -4,4 +4,4 @@ $(TEST):
 	emacs --batch --no-init-file --no-splash -l lsp-initialize.el 2>&1 | grep -v "Loading .*..." | cat
 
 interactive:
-	emacs --no-init-file --no-splash -l lsp-initialize.el -l ../../utils/rebind-for-lsp.el cexercise/browsing.c 2>&1 | grep -v "Loading .*..."
+	emacs --no-init-file --no-splash -l lsp-initialize.el -l ../../utils/rebind-for-lsp.el browsing.c 2>&1 | grep -v "Loading .*..."

tests/test_lsp_mode_in_emacs/browsing.c

@@ -0,0 +1,81 @@
+#include <stdio.h>
+
+/*
+  Follow instructions in commentaries to check C-Xrefactory source
+  browser.
+*/
+
+
+void browsing() {
+    struct ilist {int i;    struct ilist *next;} *il;
+    struct dlist {double d; struct dlist *next;} *dl;
+
+    int i,j,k;
+
+    // put cursor somewhere on 'i' variable and press F6. Then using
+    // F3 and F4 inspect all its references.  Finally pop references by
+    // pressing F5.
+    for(i=0; i<10; i++) printf("i == %d\n", i );
+
+    // put cursor on following usages of 'i' and 'j' and check scope
+    // resolution by pressing F6 followed by F5.
+    { int i;
+      i = i + 1;
+      j = j + 1;
+    }
+
+    // structure records can be browsed as well, browse 'next' or 'i'
+    // records for example.
+    il = il-> next ;
+
+    il-> i = 0;
+
+    // list all usages of this 'i' by pressing C-F6 (control F6);
+    // Note: not all environments support inputting "control F6"
+    i = 0;
+    /*
+      'F3' and 'F4' inspect previous-next reference.
+      in created (right) window:
+        'mouse-button12' goes to selected reference.
+        'mouse-button3' pops up menu.
+      always:
+        'F7' closes C-Xrefactory window.
+    */
+
+
+    // browse 'next' symbol from following line to check resolution
+    // inside used macros
+#define LISTLEN(ll,res) {res=0; for(; ll!=NULL; ll=ll-> next ) res++;}
+
+    LISTLEN(dl, k);
+
+    // ambiguity handling: put cursor on 'next' symbol and list all
+    // its usages with C-F6
+#define LISTLOOP(ll,ii) for(ll=ii; ll!=NULL; ll=ll-> next )
+    /*
+      In the created (left) window:
+        <space>     - select one symbol
+        o           - toggle to other browser window
+      also:
+        'mouse-button12' select/unselect symbol.
+        'mouse-button3' pops up menu.
+
+      As usually 'F7' closes new windows.
+    */
+
+    LISTLOOP(il, NULL) {}
+    LISTLOOP(dl, NULL) {}
+
+
+}
+
+// put cursor on the 'include' keyword and move to the included file
+// by pressing F6, then return back using F5.
+
+#include <stdlib.h>
+
+/*
+  Presentation of C-Xrefactory browser is over, F7 will close
+  C-Xrefactory window and (probably multiple) F5 will bring you back
+  to index.
+*/