Flutter: window's don't show up unless given an explicit size

[wmww]

On Flutter, windows don't show up unless an explicit size is specified. Might be related to #143. Calling gtk_widget_set_size_request(GTK_WIDGET(window), 200, 200); (with any values > 0) fixes this.

Fixed by #166.

[ssqzr]

I had the same problem. The problem can be resolved using this commit.

Is there a plan to merge this commit to the master?

[wmww]

No current plans. If someone can make a PR that passes both the tests added here I'll review it (my commit fixes test-appears-if-size-initially-unspecified but breaks test-size-can-shrink).