(Longer) Names of Subfolders or Sub-subfolders of a Folder tree not completely visible due to fixed size of left column frame

[climaxy]

The left column frame is not adjusting itself depending on the Folder tree. This means, if there are Folders with Subfolders and/or Sub-Subfolders and ev. the names of these folders are longer, then the complete name is not visible anymore and also the number of mails within this folder can't be seen, as the left column frame seems to have a fixed size. So solution would be either, that the size of the left column is adjusting itself based on the longest name (of a subfolder) or that a vertical scrollbar is implemented, so that one can scroll to the right end of the folder tree.

[alec]

Added vertical splitter in r1766.