Optimize the case of split B2 to B3 when B2 other leaf still accommodate the Entry

[dadhi]

The Branch2 thing at the right with small right leaf but full left leaf:

graph TD
L5_21030449(`21030449`,`21637`,`21637`/`131778175`,`24995`,`24995`/`221540030`,`53169`,`53169`/`507310657`,`41691`,`41691`/`631038222`,`80976`,`80976`)
L5P_364635560>`364635560`,`94562`,`94562`]-->L5_21030449
L5_761574385(`761574385`,`33461`,`33461`/`1049478692`,`15842`,`15842`/`1278461947`,`61688`,`61688`/`1593872025`,`54708`,`54708`/`2037997398`,`34187`,`34187`)
L5P_848679699>`848679699`,`7046`,`7046`]-->L5_761574385
L5PP_752405386>`752405386`,`56521`,`56521`]-->L5P_848679699
B2_648516453[`648516453`,`21318`,`21318`]-->L5P_364635560
B2_648516453-->L5PP_752405386

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