Opening a PDF in background makes Lucide display only blank pages

[herwigb]

Scenario:

1. Open an fullscreen session
2. Open a PDF using open.cmd - the PDF is opened by Lucide on the desktop
3. Switch to the desktop - the PDF seems to be only blank pages, however while the PDF is not displayed, it still can be printed normally.

[herwigb]

uses enclosed open.exe or open.cmd to open pdfs from the commandline

[dmik]

Fixed in r494. Turned out to be a tricky bug: the WM_SIZE message was ignored (due to WinIsWindowShowing() returning FALSE) when the Lucide was started in the background from a fullscreen session through OPEN, resulting to a zero page width/height and all subsequent synthesized WM_SIZE messages (sent when when e.g. switching pages) were ineffective since they would already report this zero width/height. Only resizing the Lucide window to get the real WM_SIZE with the real new window size could help.