Vadim Zeitlin 46d6866c9f Make wxGCDC::GetTextExtent("") return (0, 0) ... This seems more logical and is compatible with wxDC in wxMSW and wxGTK2, as well as other kinds of DC, e.g. wxPostScriptDC. It also looks like the current behaviour was unintentional as it happened only because wxGCDCImpl::DoGetTextExtent() always passed all non-null parameters to wxGraphicsContext::GetTextExtent(), even if it didn't need the values for all of them, and thus bypassed the special case for the empty string which was already present in the latter function. Fix this, making DoGetTextExtent() more efficient as a side effect (we now avoid unnecessary calls to pango_layout_iter_get_baseline() in the most common case), and also add another test for empty string to wxGraphicsContext itself, for non-GTK case. Also document this behaviour and add a test checking for it.		2020-07-15 02:10:34 +02:00
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wx	Make wxGCDC::GetTextExtent("") return (0, 0)	2020-07-15 02:10:34 +02:00
check_syntax.sh