I use gvim 7.0 patched 1-164. When doing :tabedit in a single tab buffer,
tabs on the top appear and the window is resized so that text area is the
same. However, when the window cannot be grown vertically (which is the case
for (vertically) maximized window or fullscreen), vim still keeps total
buffer height, which makes the bottom part (command line) of the buffer
invisible - until the window size is changed, vim is notified of the change
and calculates buffer height properly, taking tabs into account. (It doesn't
happen for vim running in terminal).
I am unable to provide a patch for the moment; if it is a known issue, I am
very sorry for duplicating the report.
- bug: commandline not visible after :tabedit in maximized... Václav Šmilauer