[Subversion Wiki] Update of "MtimePreservation" by PhilipMartin

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The "MtimePreservation" page has been changed by PhilipMartin:
http://wiki.apache.org/subversion/MtimePreservation?action=diff&rev1=3&rev2=4

   * Else if use-text-times matches and text-time is defined, mtime = text-time
   * Else, mtime = stime
  
+ (Checkout is implemented as update from r0 --philip)
+ 
+ (What happens when mtime cannot represent text-time? We try to set mtime, get some mtime' that is slightly different, store mtime' in BASE.last-mode-time, and then compare mtime against last-mod-time to determine if the mtime has changed. --philip)
+ 
  === svn update ===
   * If use-commit-times, mtime = ctime
   * Else if use-text-times matches:
@@ -40, +44 @@

    * (This is to prevent mtime-only conflicts; text-time will be reapplied in the next commit.)
    * Else if text-time is defined, mtime = text-time
   * Else, mtime = stime
+ 
+ (Deleting text-time looks wrong, that's a property mod. Better to update BASE.text-time but not attempt to set mtime. --philip)
  
  === svn merge ===
   * If no conflicts occur, behaviour is identical to svn update.
@@ -52, +58 @@

  
  === svn copy ===
   * text-time is not copied.
+ 
+ (That doesn't sound right, it makes cheap copies into expensive copies. An URL copy will preserve the property so a WC copy should do the same. --philip)
  
  === svn rename ===
   * mtime is unchanged.