On startup...
mem usage: gnome-terminal - VirtMem 52, ResMem 15.1, WritableMem4.5, SharedMem 
10.5, XServerMem 6kb , Memory 4.5

Run ls...
ls -R # (a 17mb file)

mem usage (1 tabs): gnome-terminal - VirtMem 154.3, ResMem 116.8,
WritableMem 107.2, SharedMem 9.6, XServerMem 6kb , Memory 107.2

Open a new tab.
Run ls...
ls -R # (a 17mb file)
mem usage (2 tabs): gnome-terminal - VirtMem 257.7, ResMem 220.2, WritableMem 
210.5, SharedMem 9.7, XServerMem 6kb , Memory 210.5


Open a new tab.
Run ls...
ls -R # (a 17mb file)
mem usage (3 tabs): gnome-terminal - VirtMem 360.7, ResMem 322.9, WritableMem 
313.6, SharedMem 9.3, XServerMem 6.7kb , Memory 313.6


Open a new tab.
Run ls...
ls -R # (a 17mb file)
mem usage (4 tabs): gnome-terminal - VirtMem 464.0, ResMem 426.3, WritableMem 
417.0, SharedMem 9.3, XServerMem 6.8kb , Memory 417.0


Now open a new tab do nothing in it.

Now I close the tabs and measure memory for each tab closed that had a lot of 
data in it, leave the empty one open.
mem usage (4 tabs): VirtMem 463.6, ResMem 425.9, WritableMem 416.6, SharedMem 
9.4, XServerMem 6.8kb , Memory 416.6
mem usage (3 tabs): VirtMem 463.2, ResMem 425.6, WritableMem 416.2, SharedMem 
9.4, XServerMem 6.7kb , Memory 416.2
mem usage (2 tabs): VirtMem 462.8, ResMem 425.2, WritableMem 415.8, SharedMem 
9.4, XServerMem 6.7kb , Memory 415.8
mem usage (1 tab) VirtMem 462.4, ResMem 424.8, WritableMem 415.4, SharedMem 
9.4, XServerMem 6.6kb , Memory 415.4

Now there is only a blank terminal and ~462mb is being used.

-- 
gnome-terminal scrollback leak
https://bugs.launchpad.net/bugs/243596
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