Carla
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Windows: plugin UI height is too short
It looks like if a plugin requests H pixels for height, Carla provides H-h where h is the Windoze title bar height. This screenshot comes from Win7, haven't tried on more recent versions. Left: Reaper, Right Carla. See how the bottom control labels are cropped out.
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Our plugin's VST format which is JUCE based also faces this problem on Carla running on Windows 10. The final resized GUI is a tad smaller.
VST3 on Carla opens fine though.
I don't recall which library does OB-Xd use but can confirm this also affects DPF plugins.