Description:
Memory usage is building up quite high when deleting multiple sheets with plain data

Steps to Reproduce:
1. Open Calc
2. Disable Undo (Tools -> Options -> Advanced -> Expert Configuration -> Search for Undo & change 100 to 0 steps)
3. Restart to be sure it's enabled (it probably is)
4. Open the attached file
5. Select column A t/m D (CTRL+C
6. Select Tabs 45-60 SHIFT-Click
7. Select the columns A t/m G
8. Edit -> Paste -> Wait
9. Take process monitor (Process Monitor)
10. Take a look at soffice.bin
11. Sheet -> Delete sheet (and look at the memory build up, +/- 1,5 GB while deleting). 

Actual Results:
Memory buildup between delete command & endresult

Expected Results:
It seems off to me, but I don't know the technicality's. For current case (plain data) it's rather odd, IMHO 


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.0.0.0.alpha0+ (x64)
Build ID: 4501a0ba623ad61c5a4e0b807da2e96f0e4ce82c
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win; 
Locale: nl-NL (nl_NL); UI-Language: en-US
Calc: CL