Enable Drag and Drop for SubViewports and Windows #360

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 11s
🍏 iOS / Template (target=template_release)	10m 27s
🍎 macOS / Editor (target=editor, tests=yes)	29m 32s
🐧 Linux / Editor w/ Mono (target=editor)	40m 11s
🍎 macOS / Template (target=template_release)	19m 44s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	45m 49s
🤖 Android / Template (target=template_release)	30m 9s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	35m 7s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	30m 22s
🐧 Linux / Template w/ Mono (target=template_release)	25m 25s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	22m 41s
🌐 Web / Template w/o threads (target=template_release, threads=no)	22m 58s
🐧 Linux / Minimal template (target=template_release, everything disabled)	14m 57s
🏁 Windows / Editor (target=editor, tests=yes)	48m 19s
🏁 Windows / Template (target=template_release)	34m 35s
🪲 Godot CPP / Build and test Godot CPP	7m 14s
	6h 58m 41s

Provide feedback