Fix: [Win32] Fullscreen OpenTTD cannot be alt-tabbed back into #8792
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Motivation / Problem
Alt-tabbing in and out of fullscreen when using the
win32-opengl
video driver resulted in a invisible window.Description
When alt-tabbing back into fullscreen, the main window was unnecessarily recreated, losing the OpenGL context. The game would also loose the original non-fullscreen window size, which is also fixed.
Limitations
Please test thoroughly.
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.