Unable to switch tabs with vimroom enabled

[mmwtsn]

If :VimroomToggle is only called in one tab, switching between tabs is still possible. When :VimroomToggle is called on more than one tab, Vim no longer displays the documents correctly and tab switching is not possible.

To recreate the issue find two files editable by Vim. Run vim -p file1.txt file2.txt in a terminal shell followed by:

1. :VimroomToggle
2. :tabnext
3. :VimroomToggle
4. :tabnext

Steps 1 and 2 execute successfully, however, step 3 fails. Vimroom is unable to format the tab successfully (the second file is reduced to 50% of its vertical size). At this point, I am unable to execute step 4 to switch between tabs.

Any ideas?

Note: this issue was experienced in Vim 7.3 on OS X.