eoTrimtrailingSpaces vs Read only

[JaFi-cz]

When you have editor in read only mode with enabled eoTrimTrailingSpaces and select text, it will mark editor as modified, even is in ReadOnly mode, cause change caret Y causes trim.

Synedit.pas, line 3504 (inside TCustomSynEdit.SetCaretXYEx procedure)

original code:

  //Trim here
  if (Value.Line <> fCaretY) and (eoTrimTrailingSpaces in fOptions) and

Fixed:

  //Trim here
  if not FReadOnly and (Value.Line <> fCaretY) and (eoTrimTrailingSpaces in fOptions) and

[romankassebaum]

I added your changeset.