update documentation for change in return code of "xschem switch" com…

…mand

doc/xschem_man/developer_info.html

@@ -648,6 +648,7 @@ <h1>XSCHEM <a id="cmdref">COMMAND REFERENCE</a> DOCUMENTATION</h1><br>
      <li><kbd> gridlayer </kbd> layer number for grid </li>
      <li><kbd> help </kbd> command help </li>
      <li><kbd> header_text </kbd> header metadata (license info etc) present in schematic </li>
+     <li><kbd> infowindow_text </kbd> ERC messages </li>
      <li><kbd> instances </kbd> number of instances in schematic </li>
      <li><kbd> lastsel </kbd> number of selected objects </li>
      <li><kbd> line_width </kbd> get line width </li>
@@ -1097,6 +1098,7 @@ <h1>XSCHEM <a id="cmdref">COMMAND REFERENCE</a> DOCUMENTATION</h1><br>
      <li><kbd> format </kbd> set name of custom format attribute used for netlisting </li>
      <li><kbd> header_text </kbd> set header metadata (used for license info) </li>
      <li><kbd> hide_symbols </kbd> set to 0,1,2 for various hiding level of symbols </li>
+     <li><kbd> infowindow_text </kbd> ERC messages </li>
      <li><kbd> netlist_name </kbd> set custom netlist name </li>
      <li><kbd> netlist_type </kbd> set netlisting mode (spice, verilog, vhdl, tedax, symbol) </li>
      <li><kbd> no_draw </kbd> set no drawing flag (0 or 1) </li>
@@ -1160,7 +1162,9 @@ <h1>XSCHEM <a id="cmdref">COMMAND REFERENCE</a> DOCUMENTATION</h1><br>
    if 'new_process' is given start a new xschem process </pre>
    <li><kbd>       switch [window_path |schematic_name]</kbd></li><pre>
    Switch context to indicated window path or schematic name
-   returns the # of windows/tabs in addition to main window/tab</pre>
+   returns 0 if switch was successfull or 1 in case of errors
+   (no tabs/windows present or no matching winpath / schematic name
+   found).</pre>
    <li><kbd>       symbols [n]</kbd></li><pre>
    if 'n' given list symbol with name or number 'n', else 
    list all used symbols </pre>
@@ -1266,7 +1270,6 @@ <h1>XSCHEM <a id="cmdref">COMMAND REFERENCE</a> DOCUMENTATION</h1><br>
 
 
 
-
  </ul>
 
   <!-- TCL global variables -->

src/scheduler.c

@@ -3829,7 +3829,9 @@ int xschem(ClientData clientdata, Tcl_Interp *interp, int argc, const char * arg
 
     /* switch [window_path |schematic_name]
      *   Switch context to indicated window path or schematic name
-     *   returns the # of windows/tabs in addition to main window/tab
+     *   returns 0 if switch was successfull or 1 in case of errors
+     *   (no tabs/windows present or no matching winpath / schematic name
+     *   found).
      */
     else if(!strcmp(argv[1], "switch"))
     {