Cannot drag scroll bar of comment area in normal UI

[kaorahi]

...because it is just a "picture" :p (cf. cachedCommentImage in LizzieFrame.java)

sample SGF:

(;SZ[19]C[123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
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])