When files are opened remotely, always use gtk_window_present() to bring the main window to front or whatever the window manager decides to do (part of #2276179).
On Windows, we send a pointer to the main window to the remote instance which then brings the window to the front (grab focus). This should work better than the previous implementation and should avoid the blinking tasklist item.

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@3502 ea778897-0a13-0410-b9d1-a72fbfd435f5